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ASSA ABLOY Hospitality
66 8003 015-3
Appendix B: Troubleshooting
FCU = fan coil unit
PTAC = Package Terminal Air Conditioner
A/C Unit not blowing hot/cold air
A/C unit not blowing hot/cold air
1. Confirm at the thermostat that the heat or cool symbol is displayed.
a. If the symbol is on, the call has been sent from the thermostat
to the FCU/PTAC.
b. If the symbol is not on, change the set temperature to be more than
2 degrees different from the actual temperature to engage the heat/cool call.
Note: For cool, there is a 5 minute compressor delay after the unit is turned
on, to prevent short-cycling.
2. Confirm that voltage is applied at the HVAC unit heat/cool inputs.
a. If accurate voltage is applied to the correct inputs and outputs,
additional troubleshooting must be done at the FCU/PTAC.
b. If no voltage is applied to the correct inputs, a voltage drop has
occurred between the thermostat and the FCU/PTAC. Check the wiring.
Note: See Installation manual Orion High Voltage Thermostat for information about
the heat/cool relays used.
Fan speed not working
1. Confirm the configuration of the thermostat profile with fan speeds. Make sure
that the wiring is in accordance with these settings. Change from Auto and test
the individual fan speeds.
a. If one of the fan speeds is not working, confirm that voltage is applied at
the FCU/PTAC for that fan speed. If voltage is applied to the correct fan speed,
additional troubleshooting must be done at the FCU/PTAC.
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