Daikin Altherma 3 M - Page 175

3 | Components
Service manual
175
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
Blown fuse on the main PCB? Action
No Return to "Checking
procedures"[4171] of the main PCB
and continue with the next procedure.
To check the rectifier voltage of the main PCB
Prerequisite: First perform all earlier main PCB checks, see "Checking
procedures"[4171].
1 Turn ON the power of the unit.
2 Measure the voltage on the rectifier voltage check terminals (+ and –) on the
main PCB.
Result: The measured voltage MUST be 310~325 VDC if compressor is NOT
running and 350~365VDC if compressor is running.
a
b
a + terminal
b – terminal
INFORMATION
When measuring on the front of the main PCB, make sure to locally remove the
protective varnish with the test leads of the multi meter.
Is the measured rectifier voltage
correct?
Action
Yes Perform a check of the power modules,
see "Checking procedures"[4171].
No Replace the main PCB, see "Repair
procedures"[4178].
To perform a diode module check
1 First check the rectifier voltage of the main PCB, see "Checking
procedures"[4171].
INFORMATION
If the rectifier voltage is OK, the diode module is OK. If rectifier voltage is NOT OK,
replace the main PCB.
Below procedure describes how to check the diode module itself.
2 Stop the unit operation via the user interface.