Daikin Altherma EKHBH Series Service Manual page 151

ESIE06-03
Diagnose method Diagnose can be made according to 6 LEDs lighting status as follows:
1 When all LEDs are lit uniformly, a compressor malfunction (to be replaced) has occured.
2 When some of the LEDs are not lit (LEDs are not lit or go off, etc.), check the individual power
Caution
Part 3 – Troubleshooting
transistor. (See "Check No.15")
When the power transistor and the control PCB are integrated, replace the control PCB.
When the power transistor can be checked individually, check the resistance value. (See
"Check No.15")
If NG, the power transistor may have a failure. Replace the power transistor.
If the power transistor is normal, check if there is any solder cracking on the filter PCB.
If any solder cracking is found, replace the filter PCB (or repair the soldered section)
If the filter PCB is normal, replace the control PCB.
When the output frequency is low, yhe LED flashes slowly. As the frequency increases, the LED
flashes quickly. (It looks like the LED is lit.)µ
If the operation is carried out with no load (the condition of the compressor is disconnected), some
of the units may stop operation with "CT system error" (due to no electric current) or "startup failure"
(because the compressor does not turn). In this case, check if the LED is flashing during
"operation" to "malfunction stop". (Refer to the Service Manual of each air conditioner to check
whether the alarm LEDs for CT system, startup failure, etc. are provided or not.)
On completion of diagnose by this checker, be sure to re-crimp the faston terminal before restting
the system. (Otherwise, the terminal may be burned due to loosening.)
Additional Checks for Troubleshooting
Direction of crimp
Faston terminal
This size is shortened
by "crimp".
3–65
1
3 3
4
5