ESIE15-08B
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Part 2. Troubleshooting
2. Error code based troubleshooting
Page 28
19/07/16
Daikin Altherma Monobloc CA
2.20. “E7-00” – Malfunction of outdoor unit fan motor
2.21. “E8-00” – Power input overvoltage
Possible cause
Check
Corrective action
Faulty or disturbance of the power supply.
(Imbalance > 10%) Power drop.
Short circuit.
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Adjust power supply when required.
Power reset via outdoor unit.
Faulty compressor.
Check compressor (see page 91).
Check compressor connection and wiring.
Check expansion valve operation (liquid
back issue).
Check refrigerant charge (see page 106)
+ check for leaks.
Replace the compressor when required.
(see page 125).
Investigate the reason of breakdown.
Replace expansion valve when required
(see page 131).
Fix the possible leak.
Faulty expansion valve.
After power reset, check if error occurs
when compressor is not running: check
expansion valve (see page 97).
Replace expansion valve when required
(see page 131).
Trigger
Effect
Reset
When for 16 times, the fan runs with
speed less than a specified one for 15
seconds or more when the fan motor run-
ning conditions are met.
Unit will stop operating.
Manual reset via user interface.
Possible cause
Check
Corrective action
Faulty fan motor.
Check fan motor (see page 103)
Check fan motor connection and wiring.
Replace fan motor when required. Adjust
wiring when required.
Faulty outdoor inverter PCB.
Check outdoor inverter PCB (see
page 101).
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
Adjust the power to the outdoor inverter
PCB.
Replace outdoor inverter PCB when
required (see page 122).
Blowout of fuse.
Check fuse F6U on outdoor PCB A1P.
Replace fuse when required.
Trigger
Effect
Reset
System detects overcurrent to compres-
sor of >20A for >2.5 seconds, 16 times in
5 min.
Unit will stop operating.
Manual reset via user interface.
Possible cause
Check
Corrective action
Faulty compressor.
Check compressor (see page 91).
Check compressor connection and wiring.
Check expansion valve operation (liquid
back issue).
Check refrigerant charge (see page 106)
+ check for leaks.
Replace the compressor when required.
(see page 125).
Investigate the reason of breakdown.
Replace expansion valve when required
(see page 131).
Fix the possible leak.
Faulty power transistor
Check power transistor.
Replace power transistor when required.
Faulty outdoor inverter PCB.
Check outdoor inverter PCB (see
page 101).
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
Adjust the power to the outdoor inverter
PCB.
Replace outdoor inverter PCB when
required (see page 122).
