L8-00 - Malfunction Triggered By A Thermal Protection In The Main Pcb - Daikin altherma 3 M Service Manual

2.3.61 L8-00 – Malfunction triggered by a thermal protection in the main PCB
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >4%),
▪ Power drop,
▪ Short circuit.
Prerequisite: Stop the unit operation via the user interface.
8 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Confirm the rectifier voltage is below 10 V DC before proceeding, see
electrical hazards" [
9 Check that the thermal interface grease is applied properly on the (PCB or
refrigerant piping) contact surface of the heat sink. Adjust if needed.
Possible cause: Thermal interface grease NOT applied properly on the heat
sink.
INFORMATION
Make sure to use thermal interface grease Shin Etsu G-776 (spare part number
2269571).
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
When compressor
overload (except during
start-up) is detected.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check that all stop valves of the refrigerant circuit are open. See
"4.2 Refrigerant circuit" [
Possible cause: Closed stop valve in the refrigerant circuit.
2 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
3 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 286].
Possible cause: Refrigerant overcharge or shortage.
4 Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
5 Perform a check of the main PCB. See
4
285].
Effect
Unit will stop operating.
4
286].
"4.2 Refrigerant
"4.2 Refrigerant circuit" [
"3.14 Main
2 Troubleshooting
|
"To prevent
Reset
Manual reset via user
interface.
4
circuit" [
"4.2 Refrigerant
4
286].
4
PCB" [ 171].
Service manual
286].
53