Page 8.2
P/N 88-503
Rev. 4
SYMPTOM: When controlling a residential heat pump,
and asking for cooling, the heat comes on.
CAUSE: The thermostat reversing valve jumper is set
for “b”.
REMEDY: Set the reversing valve jumper for “O”. See
pages 5.4 and 5.5.
SYMPTOM: When calling for cooling, both the heat
and cool come on.
CAUSE: The thermostat equipment jumper is configured
for “HP” and the HVAC unit is a Gas/Electric.
REMEDY: Set the equipment jumper for “Gas”. See
pages 5.2 and 5.3.
8
TroubleShootingTroubleShooting
NOTE: Due to the Random Start feature, outputs may not energize for up to 30
seconds when the thermostat is first powered (see page 16.4 of the
Owner’s Manual)
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