Ac and heater not working!

[rockfordroo]

Originally Posted by Splitshaft

And if the old sliding thermostat did fail (not likely), most digital Honeywell thermostats must be programmed (setup) for the particular system they are controlling to work properly.

Huh? Mine didn't. Honeywell RTH 111B. You can't program it.

[FORKLIFMAN]

Hi Joy
If you do not have a wire to use . disconnect the red wire and just touch one of the other wires, leave every thing on. if the a/c or heater start working , just pull the red wire away and it will shut off. If one of those worked return the thermostat for new one. If nothing worked your going to have to figure out why the red wire doesn't have power? maybe you have a blown inline fuse, near the batteries, or another fuse in the panel, may have blown. you can look at each individually or use the test light to check for power.

Another thought, do you have the wires hooked up properly to the thermostat?

keep at it
David

[Joygoetz]

Thank you! I will check all the fuses because I did only check the ac fuse. I will also do the wire test on the tstat wires. I am pretty sure I have the wires right. I did label them when I put on the new tstat. However I have the red wire in the r and not the rc is that correct? I do not have the blue hooked up, is that correct? There was also a metal jumper in the r and rc that I removed because the red wire would not go in with that wire in there?

I am out of town for a couple of days so I will do all the above when I get back.

Joy

[cavie]

Originally Posted by Joygoetz

Thank you! I will check all the fuses because I did only check the ac fuse. I will also do the wire test on the tstat wires. I am pretty sure I have the wires right. I did label them when I put on the new tstat. However I have the red wire in the r and not the rc is that correct? I do not have the blue hooked up, is that correct? There was also a metal jumper in the r and rc that I removed because the red wire would not go in with that wire in there?

I am out of town for a couple of days so I will do all the above when I get back.

Joy

If you cannot install the new stat per the supplied wiring instructions,
go to youtube and search for your AC and t-stat model #. I have a Dometic and the blue is hooked up. The red is not used. Just installed it this summer.

[rockfordroo]

Originally Posted by cavie

If you cannot install the new stat per the supplied wiring instructions,
go to youtube and search for your AC and t-stat model #. I have a Dometic and the blue is hooked up. The red is not used. Just installed it this summer.

Dometics are backwards; they switch the ground. She does not need the blue.

[rockfordroo]

Originally Posted by Joygoetz

Thank you! I will check all the fuses because I did only check the ac fuse. I will also do the wire test on the tstat wires. I am pretty sure I have the wires right. I did label them when I put on the new tstat. However I have the red wire in the r and not the rc is that correct? I do not have the blue hooked up, is that correct? There was also a metal jumper in the r and rc that I removed because the red wire would not go in with that wire in there?

I am out of town for a couple of days so I will do all the above when I get back.

Joy

If it worked initially without the jumper, I'd say you don't need the jumper. But you COULD re-install it and see what happens. But first do the shorting of the red wire to the others as I suggested. That eliminates the T-stat from the system.

[cavie]

Originally Posted by rockfordroo

Dometics are backwards; they switch the ground. She does not need the blue.

My red and blue were both hooked up on the old slide. Red was on R. r was jumpered. Now blue is on R and r is not used.

[rockfordroo]

Originally Posted by cavie

My red and blue were both hooked up on the old slide. Red was on R. r was jumpered. Now blue is on R and r is not used.

I don't know if Dometics use red or not, but I know they use blue. I also know they switch each function to ground rather than switching power (positive) to each function.

If you do some searching, you should find a better description for Dometics.

But in any case, the OP doesn't have a Dometic.

[Joygoetz]

Hello, I’m back! So I tested every fuse and they are all good. I took the blue wire and the red wire in my Tstat and touched the 12vd bulb and it did not light up. I checked the battery and it is working . I am also hooked to electric and everything is working except air and heat.

I think my red wire is not working! Any suggestions?

Joy

[cavie]

Originally Posted by Joygoetz

Hello, I’m back! So I tested every fuse and they are all good. I took the blue wire and the red wire in my Tstat and touched the 12vd bulb and it did not light up. I checked the battery and it is working . I am also hooked to electric and everything is working except air and heat.

I think my red wire is not working! Any suggestions?

Joy

Did you go to youtube and search your unit and new t-stat?

[Bama Rambler]

did you actually test the fuses with a meter or replace the fuses with a known good one to make sure they were good? A lot of times a fuse can look good but be blown.

The red wire routes through the A/C, so it's possible that there's a break somewhere between the battery and the thermostat.

[emoney]

I noticed you've said you "checked all the fuses" and even replaced some of them, however, have you also checked the "breakers"? The AC runs off 120 volts, so you need
to start at the breaker. Try flipping it off and then back on. When doing so, make sure it
stays in place in the "On" position and doesn't want to back off, towards the middle or even "off" and let us know what happens.

[Joygoetz]

Thank you for your reply! I did check all the breakers and they are nice ant right. The I check all the fuses with a meter and they said they were all good even the ac fuse. But I replaced the ac fuse any way.

Is there any way for me to get Power to that red wire that seems dead?

Thank you!

[rockfordroo]

Originally Posted by Bama Rambler

did you actually test the fuses with a meter or replace the fuses with a known good one to make sure they were good? A lot of times a fuse can look good but be blown.

The red wire routes through the A/C, so it's possible that there's a break somewhere between the battery and the thermostat.

I believe you are incorrect about the red wire (at least for non-Dometic units - the OP has a Coleman Mach).

The red wire actually is powered from the furnace. See fuse #3 for Furnace below and note that there are no AC fuses.

[FORKLIFMAN]

If your using one of the wires (that hook up to the thermostat) as a ground to test for power at the red wire, it may not light up. Unless it is a ground supply for the thermostat, You need to go onto you tube, at one of the video shows using a 12 volt light switch for your lights as a ground connection.. I would also think you have to have the batteries turned on? and even a/c supply hooked up?

[rockfordroo]

Originally Posted by FORKLIFMAN

If your using one of the wires (that hook up to the thermostat) as a ground to test for power at the red wire, it may not light up. Unless it is a ground supply for the thermostat, You need to go onto you tube, at one of the video shows using a 12 volt light switch for your lights as a ground connection.. I would also think you have to have the batteries turned on? and even a/c supply hooked up?

She has Coleman-Mach. The blue wire is the ground.

[cavie]

Since you refused to go to youtube I did it for you. Attached are 2 videos showing 2 different wiring diagrams for two different t-stats. 2nd one will follow the first. Note the wire color changes INSIDE the wall in the second video. Both wind up using only 4 wires. Both are Colman units. Since you didn't provide your model t-stat I had to ASSUME! The blue and white wires are used for high and low fan speed. Just like my Dometic. My Dometic does not use the red wire with the Honeywell. It did with the old Dometic t-stat. Your Colman does use it.

[rockfordroo]

Originally Posted by cavie

Since you refused to go to youtube I did it for you. Attached are 2 videos showing 2 different wiring diagrams for two different t-stats. 2nd one will follow the first. Note the wire color changes INSIDE the wall in the second video. Both wind up using only 4 wires. Both are Colman units. Since you didn't provide your model t-stat I had to ASSUME! The blue and white wires are used for high and low fan speed. Just like my Dometic. My Dometic does not use the red wire with the Honeywell. It did with the old Dometic t-stat. Your Colman does use it.

The drawing I attached twice now is from my Coleman Mach to Honeywell conversion. Don't know why hers would be any different, unless as you say, some wires change color somewhere. But if that is true, she could have anything, even different than the video. BTW, for whatever it's worth, a number of folks have used my drawing and no one has reported different wiring colors.

She also stated it worked originally, so I believe she has a power problem.

[bill32]

Originally Posted by Joygoetz

Thank you so much for all the great info and the pdf!!!! I am so new to rving so please excuse my ignorance. I am not sure how to ask this but when I am hooked up to 30 amp service do I also need to have the battery on?

Yes, leave the battery disconnect switch alone (in the ON position) otherwise your converter won't recharge the battery if it is low.

[NWeagleGuy]

I have the same trailer as you and had the same problem soon after I got it home from the dealer. Is your furnace outside cover just below your fresh water or city water connection ?
I found out that the seals on that cover are no good and any rain, sprinkler or water overflow will go down and short out the furnace circuit board. I made the dealer replace the board and I sealed the top and sides of the cover with RV putty. Looks funny but sure works good. Never had a problem since. You can easily pull the circuit board and clean it with electrical contact cleaner. It worked for me then.