MrCool DIY E Star Series Installation & Owner's Manual page 47

10.3 Error Code: EH 02 (Zero crossing detection error diagnosis and solution)
Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing
signal time.
Recommended parts to prepare:
• Connection wires
• PCB
Troubleshooting and repair:
Indoor main PCB is defective.
Replace indoor main PCB.
10.4 Error Code(s): EH 03 / EC 07 (Fan speed is operating outside of normal range diagnosis and solution)
Description: When indoor/outdoor fan speed is too low or too high for a certain amount of time, the LED displays
the failure code and the A/C turns off.
Recommended parts to prepare:
• Connection wires
• Fan assembly
• Fan motor
• PCB
Troubleshooting and repair:
Power off, then restart unit after 2 minutes
Shut off the power supply &
Check the wiring of fan motor.
the fan motor from the PCB.
Is it within normal parameters?
Disclaimer: The error codes and descriptions are for reference only. If your system displays any of
these codes contact a qualified technician to investigate the matter further.
Check the connections
and the power supply.
Is it normal? NO
YES
Does the problem
remain?
YES
rotate the fan by hand.
Does it turn easily?
YES
Is it properly wired?
YES
Measure the voltage for
YES
Replace the fan motor
Note: For certain models, the outdoor PCB cannot
be removed separately. In this case, the outdoor
electric control box should be replaced as a whole.
Correct the connections. Turn on the unit
when the power supply is shown to be good.
NO The unit is operating normally.
NO Find the cause of the problem and resolve it.
NO Ensure proper connections
NO Replace the PCB.
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