Troubleshooting Guide (continued).

Symptom

Possible Cause

 

Action

 

 

 

 

 

 

Heating does not come

No power to the thermostat.

 

Check that setpoint is above room temperature.

 

on.

System selection is not set to Heat.

 

Check if the circuit breaker is trippedÑreset the circuit

 

 

Heating setpoint is below room

 

breaker.

 

 

temperature.

 

Check if the fuse is blownÑreplace the fuse.

 

 

 

 

Check if the system switch at the equipment is in the Off

 

 

 

 

positionÑset to On position.

 

 

 

 

If 24 Vac is present, proceed with troubleshooting.

 

 

 

 

Wait five minutes for the system to respond (thermostat

 

 

 

 

displays Wait).

 

 

 

 

Set system selection to Heat.

 

 

 

 

 

 

Cooling does not come

No power to the thermostat.

 

Check that setpoint is below room temperature.

 

on.

System selection is not set to Cool.

 

Check if the circuit breaker is trippedÑreset the circuit

 

 

Cooling setpoint is above room

 

breaker.

 

 

temperature.

 

Check if the fuse is blownÑreplace the fuse.

 

 

 

 

Check if the system switch at the equipment is in the Off

 

 

 

 

positionÑset to On position.

 

 

 

 

If 24 Vac is present, proceed with troubleshooting.

 

 

 

 

Wait five minutes for the system to respond (thermostat

 

 

 

 

displays Wait).

 

 

 

 

Set system selection to Cool.

 

 

 

 

 

 

 

 

 

(continued)

 

 

 

 

Pub. No. 22-5128-02

 

61

69-1216

 

Page 61
Image 61
Trane XT500C manual Troubleshooting Guide