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Topic: No heat from Coleman roof unit. (Read 487 times) previous topic - next topic

No heat from Coleman roof unit.

Have an older Coleman roof AC/Heat unit giving me no heat. Not a heat pump model.
1)  I replaced the selector/function switch last year.
2)  I BELIEVE but cant prove it was working yesterday after a moving day
3)  Tried cycling temp controller with no success.
4)  Heating element cold to touch.

Blue and orange wires come from element into junction box with selector/function switch. Blue wire connected to another blue wire that exits junction box. Orange wire goes to a pin on back of selector/function switch.

Any suggestions as to where to check voltages (what pins to what wires)?
Resistance across heating element?
Any other ideas?
In restless dreams I walked alone.
Narrow streets of cobblestone.


'93 U225
Build 4337
'14 CRV Toad

Re: No heat from Coleman roof unit.

Reply #1 –
No suggestions?
In restless dreams I walked alone.
Narrow streets of cobblestone.


'93 U225
Build 4337
'14 CRV Toad

Re: No heat from Coleman roof unit.

Reply #2 –
unplug the element and see if its calling for heat through the plug(electric side).. if not element is bad?

Thought Coleman made tents ?  :))

Re: No heat from Coleman roof unit.

Reply #3 –
Hmmmm.
God forbid I try the simple stuff first.
That's a duh on me.
In restless dreams I walked alone.
Narrow streets of cobblestone.


'93 U225
Build 4337
'14 CRV Toad

Re: No heat from Coleman roof unit.

Reply #4 –
Coleman is Dometic. Dometic is Coleman. I have two Coleman/Dometic ACs up on the roof of our '89 GV.
Nitehawk,  Demolition Lady, & our NEW master, Zippy the speeding BB cat.
1989 Grand Villa 36' ORED
Oshkosh chassis, 8.2 DD V8
2006 Saturn Vue AWD

Re: No heat from Coleman roof unit.

Reply #5 –
UH, are you hooked up to 120V? ACs won't run/heat with 12V.
Nitehawk,  Demolition Lady, & our NEW master, Zippy the speeding BB cat.
1989 Grand Villa 36' ORED
Oshkosh chassis, 8.2 DD V8
2006 Saturn Vue AWD

Re: No heat from Coleman roof unit.

Reply #6 –
Quote from: nitehawk –
UH, are you hooked up to 120V? ACs won't run/heat with 12V.
Yup.
In restless dreams I walked alone.
Narrow streets of cobblestone.


'93 U225
Build 4337
'14 CRV Toad

Re: No heat from Coleman roof unit.

Reply #7 –
The resistance heating element should be similar to ones used in water heaters and electric stoves.

If you unplug the element from the wiring harness it can then be tested for continuity with a multi-meter.

Touch probes to the two male (or female) wiring plug connection points on the element.

If no BEEP (open circuit) then element is bad (burned out).
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: No heat from Coleman roof unit.

Reply #8 –
Quote from: nitehawk –
Coleman is Dometic. Dometic is Coleman. I have two Coleman/Dometic ACs up on the roof of our '89 GV.

That was a joke .. maybe I should have used a smiley face.. oh wait  ^.^d

Re: No heat from Coleman roof unit.

Reply #9 –
Quote from: DavidS –
That was a joke .. maybe I should have used a smiley face.. oh wait  ^.^d
We got it.
If you have 2 coleman dometic units, does that mean you have 4 total units up there.
In restless dreams I walked alone.
Narrow streets of cobblestone.


'93 U225
Build 4337
'14 CRV Toad

Re: No heat from Coleman roof unit.

Reply #10 –
Quote from: Chuck & Jeannie –
The resistance heating element should be similar to ones used in water heaters and electric stoves.

If you unplug the element from the wiring harness it can then be tested for continuity with a multi-meter.

Touch probes to the two male (or female) wiring plug connection points on the element.

If no BEEP (open circuit) then element is bad (burned out).
AND I can verify the element is getting 120
In restless dreams I walked alone.
Narrow streets of cobblestone.


'93 U225
Build 4337
'14 CRV Toad

Re: No heat from Coleman roof unit.

Reply #11 –
I have had Coleman heating elements fail in coaches long ago
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: No heat from Coleman roof unit.

Reply #12 –
Quote from: Caflashbob –
I have had Coleman heating elements fail in coaches long ago

And just how is that helpful to the original poster who is trying to diagnose his units?
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: No heat from Coleman roof unit.

Reply #13 –
Of course you are correct.  No help at all.

Replaced dozens of elements and maybe a few controls.  I came from Coleman days long ago
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4