15
Troubleshooting tips…
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Problem
Possible Causes
What To Do
No display/faint display
Supply voltage not correct.
•
Using a voltmeter, check the supply voltage to the
thermostat. Voltage operating range for the thermostat
is 18-30 VAC/VDC. If measured voltage is out of this
range, troubleshoot the supply voltage to the unit.
Thermostat is damaged.
•
Replace with a new thermostat. Check the supply voltage
to the unit before connecting second thermostat (see
above).
Power wiring to unit is incorrect.
•
Refer to Figures 1 & 2 in the
Installation Instructions
for
correct wiring.
Keypad buttons do
No power to the unit.
•
Make sure the display is working correctly. If not,
not work.
follow step one above.
Thermostat is damaged.
•
Replace with a new thermostat. Check the supply
voltage to the unit before connecting second
thermostat (see above).
Thermostat will not
Thermostat setpoint is satisfied.
•
Raise the temperature setpoint more than 2° above
call for heat.
current temperature.
Unit wiring is incorrect.
•
Refer to Figures 1 & 2 in the
Installation Instructions
for
correct wiring.
Unit is ‘OFF.’
•
Make sure the
FLAME
icon is displayed and blinking.
If not, push the
MODE
button until it is displayed.
Thermostat will not
Thermostat setpoint is satisfied.
•
Lower the temperature setpoint more than 2°
call for cooling.
below current temperature.
Unit wiring is incorrect.
•
Refer to Figures 1 & 2 in the
Installation Instructions
for
correct wiring.
Unit is ‘OFF.’
•
Make sure the
SNOWFLAKE
icon is displayed and
blinking. If not, push the
MODE
button until it
is displayed.
Short cycle delay still active.
•
Wait 4 minutes. The unit’s short cycle timer is in
operation.
Fan does not turn on
Fan failure.
•
Place a jumper between the R and G terminals.
with the system.
The fan should come on. If it does, replace the
thermostat.
Troubleshooting T
ips
Operating Instructions
Safety Instructions
Installation Instructions
