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Troubleshooting
Symptom
Display is blank
E0 shown on the master thermostat
E0 shown on the companion thermostat
E1 shown on the master thermostat
E1 shown on the companion thermostat
E2 shown on the display
E3 shown on the display
E4 shown on the display
E5 shown on the display
E6 shown on the display
System is not heating / cooling.
System is not heating / cooling as expected
Possible Cause
The thermostat does not have power.
The thermostat temperature sensor is not functioning
properly.
A companion thermostat will show E0 if the
temperature sensor for that zone is missing.
Wiring issue between the thermostat and the HVAC
controller or HVAC controller does not have power.
The incorrect HVAC controller or Modbus address was
selected.
Wiring issue between the processor and HVAC
controller (if HVAC controller is connected to the
processor).
The master thermostat (connected to the HVAC
controller) is disconnected from the processor.
Remote temperature sensor is malfunctioning or
misconfigured.
Changeover sensor malfunctioning or misconfigured
(applicable only for 2-pipe systems).
QS link wiring error or the thermostat did not get a
temperature reading from the system.
Incorrect HVAC controller or thermostat model.
Slab temperature sensor for underfloor heating is
missing, malfunctioning, or misconfigured.
The HVAC controller or HVAC equipment may not
have power.
Mounting location of the thermostat is incorrect.
Wiring issue between the HVAC controller and the
HVAC system.
The HVAC system may not have power.
30
Solution
Check the wiring to confirm that Common
(Black) and V+ (Red) are connected to a
24–36 V- power supply.
Contact Customer Assistance.
Check the error code on the master thermostat.
Ensure that the HVAC controller communication
link is wired correctly and isolated from all other
connections and that the HVAC controller has
power.
Enter HVAC controller selection mode and
select the correct HVAC controller and Modbus
address.
Check the wiring between the processor and
HVAC controller.
Ensure that the QS link between the master
thermostat and the processor is wired correctly.
Check the wiring between the sensor and the
HVAC controller and confirm configuration.
Check the wiring between the sensor and the
HVAC controller and confirm configuration.
Contact Customer Assistance
Ensure that SMC55-RESI and HQWT-T-HW are
being used.
Check the wiring between the slab sensor and
the HVAC controller and confirm configuration.
Ensure that the HVAC controller and HVAC
equipment have power and are correctly wired.
Consult an HVAC professional if the issue
persists.
Refer to Mounting section of the thermostat
installation guide.
Check the Wiring section in the thermostat
installation guide.
Ensure that the HVAC system has power.
P/N 032498h
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