Carrier 40MBFAQ Service Manual

40MBFAQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
28
DIAGNOSIS AND SOLUTION (CONT.)
PC 03 (High pressure protection or Low Pressure Protection Diagnosis and Solution) (CONT)
Troubleshooting
Low pressure protection
Are the low pressure protector
and the main control board wired ?
Yes
Reconnect the low pressure protector
and main control board.
Replace the outdoor main board.
No
Replace the low pressure protector.
Is the outdoor ambient
temperature too low?
No
Stop the unit.
Yes
Open the high pressure valve
of the valve core.
No
Is the high pressure valve core
fully opened?
Is the indoor fan running
properly in the COOLING mode?
Refer to the Fan Speed is Out of Control
malfunction and resolve the problem.
No
Yes
Yes
.
Check whether the refrigerant
system is functioning properly.
No
Is it in working order?
No
When the level of refrigerant is
insucient, does the system function
properly after more refrigerant is added?
Is the low pressure protector
broken? Method: Disconnect the
plug. Measure the low protector
resistance. If the protector is normal,
the vaule is 0.
No
Yes

Carrier 40MBFAQ Specifications

General

Brand	Carrier
Model	40MBFAQ
Category	Heater
Language	English