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12-11-2018, 06:56 PM
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#1
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Junior Member
Join Date: Dec 2018
Posts: 21
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97 Catalina furnace
I just purchased a new(to me) motorhome. It’s got 2 problems. The fan worked great yesterday not it doesn’t work at all. Now When I try to use the furnace I get nothing at all. On the thermostat I can switch the blower from auto to on and I can hear a relay click in the ac unit on the roof. I’ve checked the fuse box and all are good I’m stumped. Also I do not hear the pilot light trying to light or anything . So now I have no fan and still no heat lol
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12-14-2018, 10:09 AM
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#2
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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More then likely your batteries are low check them
__________________
Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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12-14-2018, 10:12 AM
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#3
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,136
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The furnace will not light without the furnace fan running. It is part of the process to light.
As mentioned, you may have low battery voltage or if plugged into shore power, the CONverter may not be working supplying 12v.
Do any other 12v items work correctly?
Have you tested for voltage at the furnace?
Do you own a multimeter and know how to use it to test for voltage?
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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12-14-2018, 10:20 AM
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#4
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Junior Member
Join Date: Dec 2018
Posts: 21
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I got the heat pump fan to work.so now I only have 1 thing that does work. I can start the motorhome and the furnace still doesn’t work. I removed the cover of the thermostat and furnace doesn’t even have a wire going to it??!! I looked up the wiring diagram and it turns out I think I am missing a wire. It has the wire supposedly going to furnace going to hp instead. I switched it still nothing.. where is the wire from the thermostat under furnace suppose to go? I’ll run a wire straight from there to wherever just to see if it works
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12-14-2018, 10:22 AM
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#5
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Site Team
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 21,551
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You wrote "supposedly going to furnace going to hp instead...." What are you calling "hp"?
__________________
2015 FR Wildcat 295RSX / GMC Sierra
Nights Camped: '13 = 49/'14 = 74/'15 = 74/'16 = 85/'17 = 110/'18 = 111/'19 = 86/'20 =108/'21 = 115/'22 = 135/'23 = 78; Booked for 2024 = 69 |
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12-14-2018, 10:33 AM
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#6
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Junior Member
Join Date: Dec 2018
Posts: 21
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Heat strip/heat pump... I have a picture but can’t upload it
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12-14-2018, 10:34 AM
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#7
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,136
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Quote:
Originally Posted by Mr. Dan
You wrote "supposedly going to furnace going to hp instead...." What are you calling "hp"?
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Heat Pump?
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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12-14-2018, 10:41 AM
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#8
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,136
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I'm guessing there is some confusion here with some of the things said.
When the OP originally said the fan wasn't working (while also mentioning the furnace) I believed them to be talking about the FURNACE fan.
I now believe they were referring to the A/C fan that also is used for the heat pump/heat strip option.
Depending on the make/model of your A/C and thermostat, there may not be any wires at the thermostat for the furnace. Some of those systems have a control box located at the A/C unit and the only cable going to the thermostat is a data cable between it and the control box. I'm thinking this may be the case since the confusing mention of the fan.
I could also be totally incorrect.
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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12-14-2018, 11:04 AM
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#9
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Junior Member
Join Date: Dec 2018
Posts: 21
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Quote:
Originally Posted by 5picker
I'm guessing there is some confusion here with some of the things said.
When the OP originally said the fan wasn't working (while also mentioning the furnace) I believed them to be talking about the FURNACE fan.
I now believe they were referring to the A/C fan that also is used for the heat pump/heat strip option.
Depending on the make/model of your A/C and thermostat, there may not be any wires at the thermostat for the furnace. Some of those systems have a control box located at the A/C unit and the only cable going to the thermostat is a data cable between it and the control box. I'm thinking this may be the case since the confusing mention of the fan.
I could also be totally incorrect.
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Oops... yes the furnace fan doesn’t work. At the time of the original post the heat pump/ac fan didn’t work but I got it to work now
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12-14-2018, 11:05 AM
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#10
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Site Team
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 21,551
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Quote:
Originally Posted by Basballace
Heat strip/heat pump... I have a picture but can’t upload it
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Look in your Welcome to the Site PM and go to the Posting 101 thread and look at post #7.
__________________
2015 FR Wildcat 295RSX / GMC Sierra
Nights Camped: '13 = 49/'14 = 74/'15 = 74/'16 = 85/'17 = 110/'18 = 111/'19 = 86/'20 =108/'21 = 115/'22 = 135/'23 = 78; Booked for 2024 = 69 |
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12-14-2018, 11:12 AM
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#11
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Junior Member
Join Date: Dec 2018
Posts: 21
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See if this works
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12-14-2018, 02:09 PM
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#12
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Junior Member
Join Date: Dec 2018
Posts: 21
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Well I took the cover off below fridge. It shows all the wiring in the back of the furnace.. there’s a couple issues. There are 2 separate blue wires that are cut. 1 from a 10 amp 120v switch, and the other from the fan itself. Issue 2 is somebody has cut the small brown wire and spliced into another wire???? Pictures below! 
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02-04-2019, 08:41 PM
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#13
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Junior Member
Join Date: Dec 2018
Posts: 21
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Bump! Still trying to figure this out.
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02-07-2019, 06:15 AM
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#14
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World Wide Wanderer
Join Date: Feb 2016
Location: Sprung Leak, NC
Posts: 1,732
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Quote:
Originally Posted by Basballace
Bump! Still trying to figure this out.
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What is the make and model of your furnace? Picture of the ID tag will help. Do you have a copy of the manual?
Sounds like someone messed with the wiring for some unknown reason. The Furnace is 12 volt DC for both the blower and the control board power.
Aaron 
__________________
Aaron & Rhonda
wahoonc & Airangel60
2016 Coachmen Concord 300DS
2015 Fusion Hybrid following along
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02-11-2019, 02:27 PM
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#15
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Junior Member
Join Date: Dec 2018
Posts: 21
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Here’s a picture of the motor which tells the model number. No I do not have a manual for it. I can get the blower to work if I jump 12v to it and I can get the regulator to put gas out if I apply 12v to that. If I switch the thermostats to furnace it doesn’t do anything. Same with air conditioning. I can switch the from auto to on and the hp fan works. Still no heat or air tho
Edit: I threw a new control/igniter??? Board in because it was only $50, didn’t help
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02-11-2019, 02:47 PM
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#16
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Senior Member
Join Date: Jun 2013
Posts: 10,833
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The Furnace is stupid. Two wires short together to start it. Often if there is a Heat Pump the Furnace might be interlocked by a relay in the Heat Pump/ AC unit.
Find the two wires going to the furnace short together.
In your second picture There is a two wire with Red and White. I bet this is the wire for the furnace and it broke off somewhere.
__________________
B and B
2022 Venture RV SportTrek STT 302 VRB Travel Trailer
2018 Heartland Landmark 365 Louisville 5th Wheel
2015 Heartland Bighorn 5th Wheel
2013 FR Rockwood 8289WS 5th Wheel
2012 FR Rockwood 2703 SS Travel Trailer
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02-11-2019, 02:49 PM
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#17
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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This might help you. There's a wiring diagram on page 5.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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02-11-2019, 02:50 PM
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#18
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Junior Member
Join Date: Dec 2018
Posts: 21
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Quote:
Originally Posted by B and B
The Furnace is stupid. .
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I agree lol
How can I figure out which 2 short together?
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02-11-2019, 02:52 PM
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#19
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Senior Member
Join Date: Jun 2013
Posts: 10,833
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Quote:
Originally Posted by Basballace
I agree lol
How can I figure out which 2 short together?
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Looking at the Schematic Blue and Blue make heat.
__________________
B and B
2022 Venture RV SportTrek STT 302 VRB Travel Trailer
2018 Heartland Landmark 365 Louisville 5th Wheel
2015 Heartland Bighorn 5th Wheel
2013 FR Rockwood 8289WS 5th Wheel
2012 FR Rockwood 2703 SS Travel Trailer
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02-11-2019, 02:54 PM
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#20
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by Basballace
I agree lol
How can I figure out which 2 short together?
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Check wiring diagram in the PDF I provided.
Find the 6-pin connector at the furnace. Verify you have +12VDC and -12VDC between connections #1 and #4.
If so, jumpering the 2 blue wires at connections #2 and #5 should fire it up, assuming everything else is working.
I see there's also a circuit breaker. Make sure it's not tripped.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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