Haier MRV5-H - 8. Service Diagnosis; 8.1 Error Code

84
D. Heating operation conrmation
Whether the warm air is blown out
Whether the air circulation is in
good condition
Whether the temperature
difference between return air and supply
air is proper (Note 1)
Whether the operating voltage is
proper (380 V ± 10%)
Whether the operating pressure is
normal (Note 3)
Whether the operating current
is at ± 15% of the standard value (at
maximum frequency) (Note 2)
Set the operation to heating mode and hold
down the operation switch for more than 5
seconds in shutdown mode.
Make all indoor units operate simultaneously
Normal
operation condition of the
compressor
rotation direction of the blade.
Check and the power supply
voltage and circuit
Check the temperature of indoor and outdoor;
Check pipe length and charging amount of the
refrigerant;
Check operating frequency of the compressor
and operating condition of the outdoor fan;
Check whether there is abnormal sound in the
compressor.
Start
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Check all indoor units one
by one.
Once stop, the outdoor
unit can't restart until 3
to 5 minutes later.