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Error code E3: Communication error of board in the outdoor unit
Switch off power to the system for 1 minute, re-
establish power supply
, start system
YES
Are the LEDs on the control board flashing?
YES
Replace the control board
NO
Is the connection between the control board
and inverter board (CN1) established correctly?
NO
Establish the connection correctly
YES
Are 3.3. Volt present between the 3rd and 4th
contact from the bottom (GND and +3.3V) of
the plug CN201 on the control board?
NO
Replace the control board
YES
Is the connection between the inverter board
and power pcb (CN12) established correctly?
NO
Establish the connection correctly
YES
Is the voltage between P and N on the power
pcb 277 – 345 V
olt?
YES
Replace the control board
NO
Replace power pcb
Error code E4: Error probe T3 register condenser / T4 air intake
Is the probe correctly mounted on the circuit
board?
NO
Correctly mount the probe on the circuit board
YES
Is the probe visibly damaged?
YES
Replace probe
NO
Are the probe resistance values OK? (See
Ä
Chapter 11.3 ‘Resistances of the
temperature probes’ on page 59)
NO
Replace probe
YES
Replace indoor unit circuit board
49
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