5-6 Heating Mode Can Work, But No Hot Air Blow
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5.Troubleshooting Guide
1)
Check if the indoor PCB is connected to the terminal correctly?
Check if the set temperature is lower than the indoor temperature?
2)
Normal
The chip IC1fails
The chip IC3fails
The chip IC4
( failsULN2003A
Replace relay(RY3)
Replace PCB
Is the chip voltage DC5.0V?IC1#7
Is the chipIC1#2 voltage high?
Is the voltage at the connecting
point of chipIC4(ULN2003A)low?
Is relay output normal?
The interconnection cord or the
4-way valve is abnormal
Check the interconnection cord
or replace the 4-way valve
restarted in some 5 minutes
after the above problems solved
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