Sanyo TH3642 / CH3642, XH3642 / CH3642, XH4242 / CH4242, XH2442 / CH2442, UH3642 / CH3642 0335MI

4. Service procedures

4)Symptom: LCD on the remote controller is displaying “CHECK E04”. (Unusual communication between the indoor and outdoor units.)

Start

Cut the breaker and remove the indoor/outdoor unit control lines connected to U1 and U2 of the indoor unit 8P terminal plate. After shorting the test pin (CN2) on the indoor unit PCB, switch the breaker on. Does the LED (red) on the PCB light up?

Yes

No

Is the contact good at the 2P connector for indoor serial communications on the outdoor unit PCB?

Yes

Replace the indoor unit PCB.

No

Correct the connections.

Cut the breaker, remove the indoor/outdoor unit control lines connected to U1 and U2 of the outdoor unit 8P terminal plate. After shorting the test pin (CN11) on the outdoor unit PCB, switch the breaker on. Do the LEDs (red, × 2) on the PCB flash?

Yes

No

Is the contact good at the 2P connector for indoor serial communications on the outdoor unit PCB?

No

Correct the connections.

Indoor/outdoor unit Replace the indoor unit PCB.

control lines are cut off

Correct the wiring.

0335_M_I

5)Symptom: LCD on the remote controller is displaying “CHECK E05”. (Unusual communication between the indoor and outdoor units)

Start

Indoor unit PCB transmission/ reception circuit defect

Replace the indoor unit PCB.

0336_M_I

SM830082

4

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