Reply
 
Thread Tools Display Modes
Old 01-08-2014, 08:13 PM   #1
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
Defective Furnace?

Purchased Rockwood 2608 WS new November 2013 and all was going well...until today with subfreezing temperatures. Furnace will not ignite. I hear a single click when furnace is turned on and then nothing. No fan turning. No ignition sound. No heat output. No unusual mechanical sounds.
Water pump ignites and heats well.
Stove burners light without problems.
No tripped breaker box.
AC/FAN works well.
Plenty of LP.
No blockage of outside vents. No LP odors from vents.
So far I have turned off LP tanks and then reengaged by turning on slowly.
I have totally disconnected/reconnected land electric power to trailer. Nothing thus far has been able to get the SUBURBAN furnace to ignite/engage.
Talked to local RV dealership (not the one I purchase unit from)...they think it is thermostat and would make a house call for $75/hr and put on temporary thermostat as they do not have right thermostat in stock.
Talked to service technician on Coach-Net...he thinks it is the furnace unit itself and instructed me to take TT to RV dealership for replacement as it is under warranty.
Anyone have any suggestions on cause/fixes? New to the RV world and am perplexed as to what else could be wrong. A bit disconcerting as this is a brand new unit in use for only 3 months.
TIA
__________________

TxTravelingRN is offline   Reply With Quote
Old 01-08-2014, 08:39 PM   #2
Moderator Emeritus
 
Dave_Monica's Avatar
 
Join Date: Sep 2007
Location: Ontario, Canada
Posts: 4,327
If the furnace isn't coming on, nothing else will happen. Here's a link to the Suburban Furnace trouble-shooting guide in the forum library... Forest River Forums - Downloads - Furnace - Suburban furnace troubleshooting

A mobile RV tech may be the best optional. Do you have electrical heaters for back-up?

Dave
__________________

__________________


Nights camped in 2013 - 55, 2014 - 105, 2015 - 63
Dave_Monica is offline   Reply With Quote
Old 01-08-2014, 08:42 PM   #3
Senior Member
 
fonzie's Avatar
 
Join Date: Sep 2010
Location: Eastern Ontario
Posts: 3,888
Well if you hear a click at the furnace then it is not the thermostat. If you have a compressor you can blow air into the inlet of the furnace air intake outside to try to make the blower fan to turn. Sometimes it is the brushes on the rotor of the motor that don't make good contact and it will not start.

PS: if you don't have a compressor but you have a shop vac, just use the exhaust output of the shop vac to blow air into the intake of the furnace...
__________________
Fonzie
2011 Rockwood 8319SS with ProPride 3P hitch/GoodYear Marathons/TST TPMS 507
2008 F250 Lariat CC SB 6.8L V10 4.10 axle ratio (NITTO TERRA GRAPLER G2 LT275/65R20E)
Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
Nights Camped:2012(36) 2013 (17) 2014 (18) 2015 (18) 2016 (36) 2017 (32) 2018 (42)
fonzie is online now   Reply With Quote
Old 01-08-2014, 08:54 PM   #4
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
Quote:
Originally Posted by Dave_Monica View Post
If the furnace isn't coming on, nothing else will happen. Here's a link to the Suburban Furnace trouble-shooting guide in the forum library... Forest River Forums - Downloads - Furnace - Suburban furnace troubleshooting

A mobile RV tech may be the best optional. Do you have electrical heaters for back-up?

Dave
Was reading that particular article when you replied. May have to drop by Walmart or Home Depot and get the equipment to check for amps draw along the circuit to see if the heater is not getting enough juice to fire up. Can't image that being the case though as it has worked ok until now. I did notice however during the last several days that the unit was short cycling, running for 3-5 minutes before shutting down and never recycling unless I turned it off and restarted unit. Obviously that was a warning sign of worse things to come.
Yes I have electric space heaters for tonight.
Thanks for relying.

Larry
TxTravelingRN is offline   Reply With Quote
Old 01-08-2014, 09:02 PM   #5
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
That was my opinion regarding the thermostat being ok if I got a click at the furnace; Not gonna get any clicks if no power to the unit. Had a hard time convincing the RV service dept of that fact. No shop vac with me as I'm on the road. Have a smaller air compressor for tire inflation that I might give a try.
Looks like I'm about to start my learning curve....

Thanks for the tip.

Larry
TxTravelingRN is offline   Reply With Quote
Old 01-08-2014, 11:12 PM   #6
Denver, CO
 
garbonz's Avatar
 
Join Date: Jan 2013
Location: Denver, CO
Posts: 2,102
Short cycling is frequently a symptom of a control board on the way out. And now it sounds like it may be gone. I would guess that its not the blower, but I would still check all the wiring and voltages just in case. Lots of vibration with going down the road so it pays to check it out thoroughly.
__________________
2017 Fuse 23T
garbonz is offline   Reply With Quote
Old 01-09-2014, 08:10 AM   #7
Site Team
 
KyDan's Avatar
 
Join Date: Mar 2008
Location: Louisville, KY
Posts: 8,508
This isn't a "short cycle" it's not doing anything other than click.
The blower might be stuck or bad.
This has been discussed here frequently.
If you can manage to turn the blower you might find it moves off
the dead spot and runs.
If so it's a bad blower motor.
I would not suspect the board yet.

You're still in warranty! Call someone!
__________________
Peace!
Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
1999 Suzuki Intruder Motorcycle
Blue Ox WD hitch

Camping days 2010-53, 2011-47, 2012-41, 2013-41, 2014-31, 2015-40, 2016-44, 2017-63, 2018-75, 2019-32
KyDan is offline   Reply With Quote
Old 01-09-2014, 08:51 PM   #8
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
Quote:
Originally Posted by KyDan View Post
This isn't a "short cycle" it's not doing anything other than click.
The blower might be stuck or bad.
This has been discussed here frequently.
If you can manage to turn the blower you might find it moves off
the dead spot and runs.
If so it's a bad blower motor.
I would not suspect the board yet.

You're still in warranty! Call someone!
It was short cycling (running 3-5 minutes and shutting off, requiring a thermostat restart) 2 days before it just stopped totally and now just a single click at furnace when thermostat turned to heat. Since its only a single click I too suspect its probably the blower not activating to create air flow to close the sail switch, complete the circuit and prepare for ignition/combustion. Since I hear nothing but a single click, do not hear/feel the blower I suspect this is the issue. I believe if the blower were operational I should still feel some air coming from the inside vents as it cycles up. I think if the problem were later in the cycle I would hear 3 clicks as it attempts to ignite but its just IMO not getting that far into the process.

I bought an air compressor today and shot air through the intake/outflow vents @ 60 PSI. No changes in symptoms...still the just a single click. I could not hear blower turn when I dusted vents. I will attempt to remove door inside RV tonight and see if I can manually turn blower.


I went to Forest River website yesterday. It seems they put the burden on local RV dealers to determine if it is a defective part. I have appointment with service dept tomorrow for inspection/repair. I suppose the RV dealership has to call Forest River for preauthorization of warranty repairs.

Located door inside RV to inspect furnace...tight quarters and screwed into place. It looks like one side has hinges for opening the door; the other side is also screwed into place. I plan on putting a latch on one side so its not so much trouble in the future to get into the enclosure. Not sure why they didn't do that initially. Looks like its going to be a PIA to pull furnace from its cramped quarter.

BTW, I've read most of the other posts regarding this issue and took some advice from those in trying to trouble shoot this issue. Seems like there are a myriad of problems that occur with these units.
TxTravelingRN is offline   Reply With Quote
Old 01-09-2014, 10:02 PM   #9
Denver, CO
 
garbonz's Avatar
 
Join Date: Jan 2013
Location: Denver, CO
Posts: 2,102
Quote:
Originally Posted by KyDan View Post
This isn't a "short cycle" it's not doing anything other than click.
The blower might be stuck or bad.
This has been discussed here frequently.
If you can manage to turn the blower you might find it moves off
the dead spot and runs.
If so it's a bad blower motor.
I would not suspect the board yet.

You're still in warranty! Call someone!

THE OP said and I quote:

I did notice however during the last several days that the unit was short cycling, running for 3-5 minutes before shutting down and never recycling unless I turned it off and restarted unit.

Read the posts BEFORE you criticize the responses, please.
__________________
2017 Fuse 23T
garbonz is offline   Reply With Quote
Old 01-09-2014, 10:03 PM   #10
Denver, CO
 
garbonz's Avatar
 
Join Date: Jan 2013
Location: Denver, CO
Posts: 2,102
Please let us know what you find out, so we all can learn.
__________________
2017 Fuse 23T
garbonz is offline   Reply With Quote
Old 01-09-2014, 10:19 PM   #11
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
Damn I seem to cause disagreement everywhere I go on here! lol If its not gas vs diesel it blower vs control board.
TxTravelingRN is offline   Reply With Quote
Old 01-09-2014, 10:32 PM   #12
Senior Member
 
Join Date: Mar 2008
Location: Southwest Missouri
Posts: 285
Sounds like the thermostat is closing the relay that has the bi-metal disk that closes and starts the fan. Had a similar thing happen with our furnace, but it was the connection(electrical) that plugs into the furnace, not making good contact.
__________________
2006 Rockwood 8272S
2005 Chevrolet Silverado
John & Pandra
Battlefield, Missouri
F.R.O.G. Member
1st International F.R.O.G. Rally Branson Missouri
JohnandPandra is offline   Reply With Quote
Old 01-09-2014, 10:40 PM   #13
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
Quote:
Originally Posted by garbonz View Post
Please let us know what you find out, so we all can learn.
Removing door inside RV right now to inspect unit for loose wires, soot, misaligned control board, etc. to try to pinpoint obvious causes. Coach-Net phone service technician mentioned underpowered unit in the differential diagnosis. I'll check or have RV service tech to check my amp draws to see if I've lost some power to the unit somehow. Can't imagine how that would have happened as the RV hasn't moved for 2 1/2 months. Maybe I've had a wire to fray and lose good contact. An underpowered unit could sure create a click but not have enough power to engage. Hopefully manufacturer didn't cut corners and put low grade wiring to unit. I checked thermostat and has good contact; symptoms suggests its beyond thermostat anyway.
Guess I need to review the information on the unit more to see exactly what the sequence is for the entire unit to engage and try to pinpoint exactly where it is faulting.
TxTravelingRN is offline   Reply With Quote
Old 01-09-2014, 10:47 PM   #14
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
Quote:
Originally Posted by JohnandPandra View Post
Sounds like the thermostat is closing the relay that has the bi-metal disk that closes and starts the fan. Had a similar thing happen with our furnace, but it was the connection(electrical) that plugs into the furnace, not making good contact.
Certainly a possibility. Right now I'm leaning more towards an electrical component versus a mechanical cause. The unit just isn't old enough IMO to have enough wear & tear for it to be mechanical. The RV has only been towed about 200 miles since purchase....sitting ever since and heater has only been used about 1 month. Bad units do happen though...
TxTravelingRN is offline   Reply With Quote
Old 01-09-2014, 10:53 PM   #15
Denver, CO
 
garbonz's Avatar
 
Join Date: Jan 2013
Location: Denver, CO
Posts: 2,102
Underpower? You might want to check your battery voltage. Are your lights working okay and the other 12volt systems? looking for loose connections is a good first start.
__________________
2017 Fuse 23T
garbonz is offline   Reply With Quote
Old 01-09-2014, 10:55 PM   #16
Senior Member
 
Join Date: Mar 2008
Location: Southwest Missouri
Posts: 285
Frustrating for sure. We had used our trailer probably 3 or 4 times before our furnace problem showed up. Worked great until that. Wouldn't fire and did the same thing. Got to where there wasn't any sound. That is where our problem was. Might have been road vibration loosening that connector. They don't provide a very good access door to look at furnaces in RV's.
__________________
2006 Rockwood 8272S
2005 Chevrolet Silverado
John & Pandra
Battlefield, Missouri
F.R.O.G. Member
1st International F.R.O.G. Rally Branson Missouri
JohnandPandra is offline   Reply With Quote
Old 01-09-2014, 10:56 PM   #17
Senior Member
 
Ford Idaho's Avatar
 
Join Date: Sep 2013
Location: Idaho
Posts: 9,839
What brand is the thermostat?


http://www.google.com/url?sa=t&rct=j...59026428,d.cGU

https://www.google.com/search?q=repl....com&x=24&y=12


http://www.google.com/url?sa=t&rct=j...59026428,d.cGU

I would swap the thermostat out, easy to do and the cheapest.
__________________
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping
Ford Idaho is offline   Reply With Quote
Old 01-10-2014, 12:20 AM   #18
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
Quote:
Originally Posted by garbonz View Post
Underpower? You might want to check your battery voltage. Are your lights working okay and the other 12volt systems? looking for loose connections is a good first start.
Everything else powers up ok. Haven't had any issues except when I attempted to use 2 space heaters simultaneously...breaker tripped immediately. I might put a surge meter/protector on the RV park power hose just for protection against spikes/undercurrent. Oh the learning curve...

Got the cover off to expose the furnace...its gonna be a real bitch to get to! Totally surrounded by particle board/carpet next to and under bed. Hope the technician is a good carpenter! The gas/electric/thermostat connections are on the far side, the most difficult area to get to. Room Air Wheel part of blower was where I could inspect it. Looks clean and spins freely without any wobble/noise. Attempted to start furnace after turning wheel and shaft...no such luck.




From Suburban Furnaces Manual the sequence is this:

I. The wall thermostat controls the operation of the furnace by reacting to room
temperature, this allows current to flow through the On/Off switch to the module board.
The thermostat controls the operating circuit to the furnace by reacting to room temperature to open and close a set of contact points which allows current to flow to the ON and OFF switch then to the relay.
The relay receives the power and allows power to pass through to the switch within the relay. This is done by a
heater coil within the relay which actuates a bi-metal disc closing the relay circuit.
IF OK, THEN...

II. The module board constantly checks for a minimum 9.5 volts. If there is not 9.5 volts,
the module board will go into a stand by mode until adequate power is supplied. It will
then resume normal operation.

IF OK, THEN...

III. Upon a call from the thermostat, the module board thermostat circuit will go active. The
sail switch circuit is verified as being open. The blower output is energized. Blower
motor starts.

STOP THERE...Blower never engages so the problems MUST be one of the 3 above or the blower itself which I doubt.

Remote possibility would be a failed sail switch but is unlikely.

I'm hoping its just a module board that just has come loose and isn't making good contact. I shall find out tomorrow I guess. I did have a bag storm here a couple of weeks ago that could have possibly rattled the board a bit...60 mph gusts. It was a long night!
Attached Thumbnails
Click image for larger version

Name:	Furnace Wheel.jpg
Views:	65
Size:	51.1 KB
ID:	44709  
TxTravelingRN is offline   Reply With Quote
Old 01-10-2014, 12:35 AM   #19
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
Quote:
Originally Posted by Ford Idaho View Post
It is a Coleman-Mack. Of course it would be the one the local RV dealership doesn't have in stock. From reading other threads I understand the stats put in these RV's are not of the best quality. If my issue turns out to be a thermostat issue I probably will replace with a better digital stat.
Attached Thumbnails
Click image for larger version

Name:	Coleman-Mack.jpg
Views:	70
Size:	52.0 KB
ID:	44710  
TxTravelingRN is offline   Reply With Quote
Old 01-10-2014, 06:35 PM   #20
Senior Member
 
TxTravelingRN's Avatar
 
Join Date: Jan 2014
Location: On the Road
Posts: 128
Ding Ding.
Garbonz you get the prize. Bad relay on module. Warranty covered the $260 price of part + labor. Took about 1 1/2 hrs to replace. Getting good heat now. Got a little nervous when I got RV back to park as the furnace ran for 3 minutes and shut off. I was thinking "crap here we go again" then I remembered the temp outside was in the mid-60's so of course it shut off.
Happy camper now...mostly. Was setting up RV and leveling. NOW the side-to-side leveling jacks aren't working! Oh well, off to do more research on what has gone wrong. Service guy is supposed to call me tomorrow to let me know if he might have loosened a wire to get to furnace.
__________________

__________________
--------------------------------------------------

2013 F350 Lariat 6.7 Diesel DRW
2013 Rockwood Ultralite 2608 WS
2013 Days Camping: 61
2014 Days Camping: 200+
TxTravelingRN is offline   Reply With Quote
Reply

Tags
furnace

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 09:20 PM.


×