Trane XR90 light codes and problem
Posted 29 October 2011 - 09:34 AM
Went to turn on our Trane XR90 unit today, and no luck with heat!
Unit is propane run, about 5 years old.
When I try to turn the unit on, it display a series of 3 flashes on the light indicator. The guide code says this is a "draft pressure error." Not sure what this means.
If I set the fan to "on", it blows air in the house, but not hot air.
I have absolutely no experience with this - do I call the repairman or is this something I can do?
Posted 29 October 2011 - 11:56 AM
Posted 29 October 2011 - 04:01 PM
Posted 29 October 2011 - 04:29 PM
does the Vent Motor run OK ?
... "draft pressure error."
Did any critters build a nest in your Vent system ?
- kdog likes this
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Posted 30 October 2011 - 09:40 PM
Don't think there are any critters - will check vent motor. Can you provide any help on checking that? Is it as simple as turning fan to on?
Posted 31 October 2011 - 08:29 PM
This fan motor (IFM) will come on first when the thermostat calls for heat. It will run for a while, usually 30 seconds or more, before the ignition cycle begins. There are pressure switches (at least one) which will detect the negative pressure caused by the IFM.
In your case a pressure switch is apparently not closing, but this can have a variety of reasons besides a faulty pressure switch.
When you remove the furnace door, very likely there is a door interlock switch which will de-energize the furnace when the door is opened. You can hold this switch closed, but be very careful if you do, because now the exposed wiring is live 120VAC. The IFM should be running when the furnace is running or when trying to start. If not, there is the problem. Touch the motor casing carefully, it may be very hot. Keep your hands away from wires.
If the IFM is happily whirring away, then you may have stopped-up condensate lines. Flexible tubing leads from the pressure switch(es) to a collection box and/or to the IFM casing. Flexible tubing drains the collection box and/or casing into a condensate trap or to a pump or directly into a drain in the floor. Disconnect those one-by-one and see if any water comes draining out. If so that's a problem.
Post pics if you get crossed up about any of this.
- kdog likes this
Posted 06 November 2011 - 03:01 PM
Thank you to everyone who had a suggestion!
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