Haier MRV II - Page 121

Part 3
[30/31] high/low pressure switch circuit
A
if in heating indoor
fan motor is normal
if indoor EEV is normal
if the connector,
capacitor,fan motor
are normal
eliminate the abnormal reasons
modify
check and rewiring if faulty
replace sensor
if heat exchanger
/filter are clogged or the
air flow is in short circuit
check if indoor PCB is
faulty, if yes, replace it
if indoor/outdoor
communication is
proper
no
yes
no
no
no
if the connector,
the coil are normal
yes
modify
yes
yes
yes
no
no
no
no
yes
yes
if the valve body is
clogged
replace the valve body
if refrigerant is too
much, or the pipe
is bended, or
overload
if characteristic of
coil/defrost/suction temp.
sensors are normal
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