12-3-7. Outdoor Unit Power Supply Failure
Measure voltage between Terminals 5 – 6 on terminal block of outdoor unit.
Set temperature by remote controller so conditioner operates under Thermo. ON in either cooling or heating operation, then start operation. Then measure voltage between Terminals 1 – 2 on terminal block of outdoor unit.
Caution: It is not possible to measure while
Normal
AC 104 – 126 V
*Use a circuit tester (set to AC range).
In case of abnormality ➞ Check connection of
No abnormalities, replace indoor unit PCB.
No abnormalities, proceed to check
12-3-8. Outdoor Unit Power Transformer Defective
➀Check voltage of power transformer.
Measure voltage of 4P connector (CN10A), 3P connector (CN10B) and 2P connector (CN09) of indoor unit PCB (without disconnecting connectors).
| 4P, CN10A | RED – RED | 20 | – 30 V |
|
|
|
|
|
| |
Normal | BLU – BLU | 10 | – 15 V |
| |
|
| ||||
3P, CN10B | YEL – YEL | 85 – 115 V |
| ||
|
| ||||
|
|
|
|
|
|
| CN09 | ORG – ORG | 104 | – 126 V | * Use a circuit tester (set to AC range). |
Caution: Care should be taken that the tips of the tester rods do not touch each other since the circuit is electrically charged.
In case of abnormality ➞ Replace power transformer.
No abnormalities, replace outdoor unit PCB.
Caution: Carry out this check only after cutting power at the mains or disconnecting unit from the power supply.
➀Check temperature overload relay for continuity.
Normal
1 Ω or less
* Use a circuit tester (set to Ω range).
In case of abnormality ➞ Check it again after more than 30 minutes (wait for it to cool down). If the result is the same, replace the temperature overload relay.
No abnormalities, check wiring to overload relay.
57
