Mitsubishi Electric PEY Series Service Manual page 34

TROUBLESHOOTING
Error Code Abnormal point and detection method
Indoor controller board
Fb Abnormal if data cannot be read normally from
(FB)* the nonvolatile memory of the indoor controller
board.
Remote controller control board
1 Abnormal if data cannot be read normally
from the nonvolatile memory of the
E1 remote controller control board.
or (Error code: E1)
E2
2 Abnormal if the clock function of remote
controller cannot be operated normally.
(Error code: E2)
Forced compressor stop
(due to water leakage abnormality)
1 The unit has a water leakage abnormality
when the following conditions, a) and b),
are satisfied while the above-mentioned
detection is performed.
a) The intake temperature subtracted with
liquid pipe temperature detects to be less
than -10°C for a total of 30 minutes.
(When the drain sensor is detected to be
NOT soaked in the water, the detection
record of a) and b) will be cleared.)
b) Drain float switch detects to be in the
PA
water for more than 15 minutes.
* Once the water leakage abnormality is
detected, abnormality state will not be
released until the main power is reset.
Abnormal refrigerant circuit
During Cooling, Dry, or Auto Cooling
operation, when the following are regarded as
failures when detected for one second.
a) The compressor continues to run for 30 or
more seconds.
PL
b) The liquid pipe temperature or the
condense/evaporator temperature is 75°C
or more.
* These detected errors will not be
cancelled until the power source is reset.
HWE1305A
Cause
1 Defective indoor controller
board
1 Defective remote controller
1 Drain pump trouble
2 Drain defective
• Drain pump clogging
• Drain pipe clogging
3 Open circuit of float switch
4 Contact failure of float switch
connector
5 Dew condensation on float
switch
• Drain water descends along
lead wire.
• Drain water waving due to filter
clogging.
6 Extension piping connection
difference at twin, triple,
quadruple system
7 Miswiring of indoor/ outdoor
connecting at twin, triple,
quadruple system
8 Room temperature thermistor/
liquid pipe temperature
thermistor detection is
defective.
1 Abnormal operation of 4-way
valve
2 Disconnection of or leakage in
refrigerant pipes
3 Air into refrigerant piping
4 Abnormal operation (no
rotation) of indoor fan
• Defective fan motor.
• Defective indoor control board.
5 Defective refrigerant circuit
(clogging)
34
Countermeasure
1 Replace indoor controller board.
* The check code in the parenthesis indicates
PAR-30MAA model.
1 Replace remote controller.
1 Check the drain pump.
2 Check whether water can be drained.
3 Check the resistance of the float switch.
4 Check the connector contact failure.
5 Check the float switch leadwire mounted.
Check the filter clogging.
6 Check the piping connection.
7 Check the indoor/ outdoor connecting wires.
8 Check the room temperature display of
remote controller.
Check the indoor liquid pipe temperature
display of outdoor controller board.
1 When this error occurs, be sure to
replace the 4-way valve.
2 Check refrigerant pipes for disconnection or
leakage.
3 After the recovery of refrigerant, vacuum dry
the whole refrigerant circuit.
4 Refer to section 9-6-2.
5 Check refrigerant circuit for operation.
* To avoid entry of moisture or air into
refrigerant circuit which could cause
abnormal high pressure, purge air in
refrigerant circuit or replace refrigerant.