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Randall, RVIA Certification
Category: RV
Satisfied Customers: 11910
Experience:  RVDA/RVIA Master Certified Technician with many years experience.
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Blew out a tire on the right rear. Destroyed the tool box

Customer Question

Blew out a tire on the right rear. Destroyed the tool box and the wiring. Got the furnace to work but now can't get the a/c to work. Any help is appreciated.
JA: When it comes to this particular vehicle, have flat tires been a problem in the past?
Customer: No not at all. We've actually only had it for a little over a year. No problems before the blowout
JA: What is the model/year of your RV?
Customer: 2003 Keystone raptor fifth wheel
JA: Are you fixing your RV yourself? What have you tried so far?
Customer: Like I originally said, I got the furnace to work. But now can't get the A/C to run
JA: Anything else you want the mechanic to know before I connect you?
Customer: That's all I know of
Submitted: 2 months ago.
Category: RV
Expert:  Randall replied 2 months ago.

Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.

Expert:  Randall replied 2 months ago.

The A/C and furnace share the same positive feed. Do you have a separate thermostat for the furnace or are they both on the same one?

Customer: replied 2 months ago.
They are on the same thermostat
Expert:  Randall replied 2 months ago.

Then it must be something in the AC side of the power unless the thermostat was damaged.

Expert:  Randall replied 2 months ago.

I​f the furnace works then the thermostat is getting the needed DC voltage. Check the service breaker for the A/C as that may have been tripped in the process.

Customer: replied 2 months ago.
Don't know about that. Like I was saying. I got the furnace to kick on and heat up. I check the power strip on the actual ac unit. It seems to have the proper amount of voltage on ac and dc sides.
Customer: replied 2 months ago.
All the breakers and fuses are good.
Expert:  Randall replied 2 months ago.

If there was a short in the furnace circuit it may have damaged the thermostat. If all else seems good that is the most likely cause here. Is this a Single Zone thermostat?

Customer: replied 2 months ago.
Not really sure what you mean by that. But I would say yes. Is there a way to check the thermostat with a meter or test light? To see if it is functioning properly?
Expert:  Randall replied 2 months ago.

It might be difficult, but it can be done. You would have to see if there is any signal on the comm wire AT the control board in the A/C when you ask for "Hi Cool" and that might tell you. In the shop it just takes a few minutes to change one out so we do it that way. These thermostats are not that expensive.

Customer: replied 2 months ago.
Ok. I will order a thermostat and try that. Thank.
Expert:  Randall replied 2 months ago.

Order the whole kit just in case it is the control module. Always good to have a few spare parts around for an emergency.