The pressure switches
PF2 or 3 or both for
HVAC are disconnected.
Check the air pressure
differential switch.
If the cable is loosen, secure
the cable.
If the air pressure differential
switch is broken, replace it.
Check the set point of the
air pressure differential
switch.
If the set point is not near 50
Pa, change it back.
HVAC AC
power
powered off
alarm
The PLD will display
A31/A32
The AC power is
powered off
If the breaker is broken,
replace it.
Check the AC power
source.
If the AC power plant has no
power, check the power
source.
Check the ports B3 & B4
of HVAC 2.
If the B3 or B4 or both are
broken, replace the controller.
If the cables connected to B3
or B4 or both are loose,
secure them.
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