Carrier 33CS450-01 Owner's Manual download pdf (Page 24)

P/N 88-507

Rev. 4

Carrier

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.

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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Carrier 33CS450-01 Owner's Manual Page 24