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I have a Trane XR80 furnace. the error code is flashing 4…

Customer Question
I have a Trane...

I have a Trane XR80 furnace. the error code is flashing 4 times, which the manual says, its a temperature switch is open. my blower fan goes on and blows hot air for about 2 minutes, but then the fan goes off.

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

Filter is clean. thermostat is on 60 and the temperature in the house is 55

Contractor's Assistant: Do you plan on doing the work yourself?

If it is an easy fix. I just changed the fan run capacitor, because I thought that was the problem

Contractor's Assistant: Anything else we should know to help you best?

Do you think it could be the fan limit switch, that needs to be changed

Submitted: 3 months ago.Category: HVAC
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Answered in 1 minute by:
3/25/2018
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 months ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,120
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified

Hello,

are you saying the fan (blower that blows through vents) is stopping? Or the exhaust fan and gas burner are stopping and the blower for registers continues?

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Customer reply replied 3 months ago
blower that blows through the vents stops blowing.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 months ago

Thank you,

This is going to be one of 2 things.....it is either the circuit board or the motor is overheating and shutting down on thermal.

It will not be related to limit switches.

Do you have a voltmeter?

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