Honeywell SERIES COMMUNICATING TB7600 - Manual (Page 22)

TB7600 SERIES COMMUNICATING RTU/HEAT PUMP THERMOSTATS
62-2016—01 22
Table 19. Troubleshooting Guide for Heat Pump Models
Symptom Possible Cause Corrective Action
Auxiliary heat does not
operate Wrong mode selected Select emergency heat mode
Thermostat in Unoccupied
mode Select Occupied Hold in Schedule hold or Override to force
the thermostat Occupied heating setpoint
Anti-cycle delay active Wait, the anti-cycling period will end and the equipment will
start
Heating setpoint is satisfied Raise the Heating setpoint
High Balance point attained Mode is locked out based on outside air temperature
Change configuration parameter High BP to value 90 F (32 C)
to by-pass lockout
Heating lockout attained Mode is locked out based on outside air temperature
Change configuration parameter H Lock to value 120 F (49 C)
to by-pass lockout
Wiring error Start the Fan by forcing the Fan ON mode
Put a jumper across terminals RH and W1. The heating
should come ON. If it does not, verify wiring and check if a
jumper is required between RC and RH
Heat pump does not
operate in heating mode Wrong mode selected Select heating mode
Thermostat in Unoccupied
mode Select Occupied Hold in Schedule hold or Override to force
the thermostat Occupied heating setpoint
Anti-cycle delay active Wait, the anti-cycling period will end and the equipment will
start
Heating setpoint is satisfied Raise the Heating setpoint
Low Balance point attained Mode is locked out based on outside air temperature
Change configuration parameter Low BP to value -12 F
(-24 C) to by-pass lockout
Heating lockout attained Mode is locked out based on outside air temperature
Change configuration parameter H Lock to value 120 F (49 C)
to by-pass lockout
Wiring error Start the Fan by forcing the Fan ON mode
Put a jumper across terminals RH and W1. The heating
should come ON. If it does not, verify wiring and check if a
jumper is required between RC and RH
Wrong reversing valve
configuration Wrong selection of parameter Re Valve
Select O will energize the valve in cooling operation. Valve is
normally heat.
Select B will energize the valve in heating operation. Valve is
normally cool.
62-2016.fm Page 22 Thursday, April 14, 2011 1:40 PM