Haier AB602ACERA — indoor Troubleshooting Guide for Low Pressure Alarm Conditions [177/259]

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Indoor troubleshooting:

Outdoor indicator shows 11000.

Alarm condition: outdoor system pressure is lower than 0.05MPa.

12) Outdoor low pressure abnormal

outdoor indicator shows 11000

yes

low pressure

abnormal

replace pressure

switch

yes

dredge piping

check if piping is blocked

yes

check if high

pressure is low,too

Lack of refrigerant, charge

additional refrigerant and check if

piping leaks, if yes, replace piping

measure actual pressure by a

pressure gauge to adjust the

output failure

Alarm condition: ambient temperature sensor is in short

circuit or open circuit for 2 seconds continously.

if sensor is fixed

well

Relocate

reconnect

check if the wiring is

correct according to

wiring diagram

Is sensor short-circuit

or open-circuit?

Replace sensor

Is sensor resistance

acceptable?

Replace sensor

Replace PCB

yes

1) Sensor failure

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