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Service Manual VMH SerieS Heat Controller, Inc.
9.3.2.6 High pressure protection (ODU P1) (Only for A-VMH36QC-1)
Replace outdoor main board
Evacuate the refrigerant, then use
high pressure nitrogen or refrigerant
to blow pipe, vacuum and recharge
with refrigerant again
Clean the heat exchanger
Remove all obstructions for proper ventilation
Stop the unit
Replace high pressure protector
Reconnect it properly
No
High pressure protection
Is the wiring between
the high pressure switch
and main control board is
connected correctly?
No
Yes
Yes
Yes
Yes
Yes
Is the high pressure
protector broken?
Short circuit the high
pressure protector socket,
check whether the system
can run normally now?
Yes
Check whether
the refrigerant
system is ok
Check whether the
outdoor ambient
temperature is higher than
109.4°F (43°C)?
Check whether the outdoor
unit’s airow is obstructed
Check whether the heat
exchanger is dirty
Check whether the
refrigerant circuit has a
blockage
No
No
No
No
Yes