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Symptom Cause
Thermostat does not call for heat
Minimum-off times. Change the mode to OFF first, then change the mode
to EMERGENCY HEAT and make a call for heat.
Emergency Heat does not come on at all
RH terminal not connected – see wiring diagrams.
Heating equipment power not on.
Fan comes on before heat starts, or
Change position of ELECT/GAS dip switch – ELECT for electric heat systems
Fan does not come on with heat
(fan on with heat call) or to GAS for fossil fuel systems where the fan is
controlled internally by the heating equipment.
TROUBLESHOOTING – EMERGENCY HEAT OPERATION10. CHECK EMERGENCY HEAT OPERATION (Heat Pumps Only)
Notes:
• To avoid the minimum on and off times during system
checkout, always start and end the check out
procedure in the OFF mode.
1. Set the thermostat to the OFF mode.
2. Set the thermostat to the EMERGENCY HEAT mode.
• With the O/B configuration setting in the B position (ON),
the O/B terminal will be on in the Emergency Heat mode. In
the O position (OFF), the O/B terminal will not be on in the
Emergency Heat mode.
3. Raise the temperature setting above the room temperature to
activate Emergency Heat. The mode display will change from
“EHEAT MODE” to “HEATING”, which will flash, when the
thermostat is calling for heat. Fifteen (15) seconds must
elapse between each stage. Verify the correct outputs are on
according to the configuration settings shown below:
Configuration Settings
Single/Multi
The same outputs come on
regardless of how these are set.
HP/HC
Elect/Gas Elect Gas
Aux. Ht. Stages The same outputs come on regardless of how these are set.
Outputs Energized
1st Stage Emer. Heat W1, G W1
2nd Stage Emer. Heat W1, W2, G W1, W2