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Communication Error Between The Indoor And Outdoor Units - Haier HSM18HEKC03/R2 Service Manual

Ek series wall mounted type air conditioner
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HSM18HEKC/HRAC03/R2(DB)HUM18HC03/R2(DB)-SM

7.3.8 Communication error between the indoor and outdoor units

Indoor display
Outdoor: display
Method of
The date received from the another unit in indoor unit-outdoor unit signal transmission is
Malfunction
checked whether is normal
When the date sent from the another unit cannot be received normally,or when the content
of the data is abnormal
indoor unit- outdoor unit signal transmission error due to wiring error
Faulty PCB
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector,
or else parts damage may be occurred.
Restart the a/c and it
becomes normally.
NO
If starting up normally, but
malfunction occurs again
after a while
No
Check whether the linking cable
between the indoor and outdoor
is well connected or whether its
core wires are well insulated.
Yes
A
E7
LED1 flash 15 times
Yes
Yes
No
63
The outdoor mainboard needs
dehumidification.
The outdoor mainboard
needs dedust.
1. Reconnect the linking cable;
2. Replace the linking cable with
new one.
Domestic Air Conditioner
Service Diagnosis

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