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Old 04-06-2019, 03:50 PM   #1
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Model: Four Winds 33SW
State: Idaho
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Angry Roof A/C's Dead

I recently swapped out the analog Coleman-Mach thermostats with digital ones. I made sure the wiring on the thermostats matched the old ones. Now the roof A/C's will not come on. No compressor or fan in either one. The A/C circuit breakers are both on and not tripped. I hear the relays in the thermostats click and they report 'COOL ON" steady on both but nothing out of the A/C's.


Are there reset switches someone I am not aware of?


Any help appreciated!


Marshall
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Old 04-06-2019, 04:32 PM   #2
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No reset that im aware of. Double check your wiring, im assuming that you have the correct thermostat 1 stage heat 1 stage cool. Try touching red wire to yellow wire with power on the fan should come on, maybe a bad stat?
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Old 04-06-2019, 05:25 PM   #3
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Quote:
Originally Posted by IdahoPoes View Post
I recently swapped out the analog Coleman-Mach thermostats with digital ones. I made sure the wiring on the thermostats matched the old ones. Now the roof A/C's will not come on. No compressor or fan in either one. The A/C circuit breakers are both on and not tripped. I hear the relays in the thermostats click and they report 'COOL ON" steady on both but nothing out of the A/C's.


Are there reset switches someone I am not aware of?


Any help appreciated!


Marshall
Please keep us updated on the fix.
& the pros & cons after you get it working.

Good luck.
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Old 04-06-2019, 09:02 PM   #4
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Originally Posted by Ron1Z View Post
No reset that im aware of. Double check your wiring, im assuming that you have the correct thermostat 1 stage heat 1 stage cool. Try touching red wire to yellow wire with power on the fan should come on, maybe a bad stat?

Thanks!! I'll give the jumping red to yellow a try. If bad thermostat then it would be two of them (front AC and rear AC separate thermostats - both changed).
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Old 04-06-2019, 09:03 PM   #5
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Originally Posted by safari View Post
Please keep us updated on the fix.
& the pros & cons after you get it working.

Good luck.

Will do!
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Old 04-06-2019, 09:23 PM   #6
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Talking

Jumper red and yellow together did not cause the fan to come on. I know the thermostats are good because I hear them clicking when set to cool.


Decided to look at 12V fuses. One labeled 'Appliances' (15 A). Checked it and it was blown. I replaced the fuse and all is well now.


Thanks for the tip on isolating the thermostat - that caused me to check the 12V angle.


Both thermostats now digital with a very narrow temperature swing.


Marshall
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Old 04-06-2019, 09:52 PM   #7
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Congratulations!
How does it feel to be one of "The Cool Kids"?
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Old 04-06-2019, 11:33 PM   #8
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Use a voltmeter and check that red (RH/RC/R terminal or whatever is used on thermostat) has +12vdc on it.....also depending on the thermo the RH and RC terminals should be jumpered together if they are separate terminals)......so if touching the RC terminal to Y terminal (which is for cooling compressor) and there is no joy......try checking that the blue (B) is grounded on the thermostat. If the thermo has its own batteries then what used to terminate on the B terminal of the old analog thermos (coach ground) has to still provide ground to the relay in the air conditioning control box......usually accessible by removing the inside ceiling escutcheon vent panel of each air conditioner if you need to get in there. Check the wiring behind the thermo first though. The fact that both air conditioners and two new thermostats are doing the same thing.....means the trouble is probably the common denominator......the person wiring missed some little thing I suspect. Maybe?
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Old 04-06-2019, 11:37 PM   #9
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oops missed the "part about you fixed it already".....I'll just go back to sleep then.
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Old 04-07-2019, 11:36 PM   #10
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Quote:
Originally Posted by IdahoPoes View Post
Jumper red and yellow together did not cause the fan to come on. I know the thermostats are good because I hear them clicking when set to cool.


Decided to look at 12V fuses. One labeled 'Appliances' (15 A). Checked it and it was blown. I replaced the fuse and all is well now.


Thanks for the tip on isolating the thermostat - that caused me to check the 12V angle.


Both thermostats now digital with a very narrow temperature swing.


Marshall
We replaced our analog with a digital over a year ago. No comparison. The temperature range is now within a degree or two (makes sleeping MUCH more enjoyable instead of the "sweating and freezing" saga of the analog unit)

Definitely a worthwhile upgrade!
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Old 04-08-2019, 01:26 AM   #11
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THOR #7466
Quote:
Originally Posted by IdahoPoes View Post
Jumper red and yellow together did not cause the fan to come on. I know the thermostats are good because I hear them clicking when set to cool.


Decided to look at 12V fuses. One labeled 'Appliances' (15 A). Checked it and it was blown. I replaced the fuse and all is well now.


Thanks for the tip on isolating the thermostat - that caused me to check the 12V angle.


Both thermostats now digital with a very narrow temperature swing.


Marshall




Great,Good for you.
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