Daikin FTKS20DVMW(L), Service Manual, Page: 157 / 228

Check SiENBE04-507A
148 Service Diagnosis
5.1.7 Outdoor Unit Fan System Check
Check No.9
DC motor
5.1.8 Power Supply Waveforms Check
Check No.10
Measure the power supply waveform between pins 1 and 3 on the terminal board, and check
the waveform disturbance.
„
Check to see if the power supply waveform is a sine wave (Fig.1).
„ Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2)
5.1.9 Inverter Units Refrigerant System Check
Check No.11
Check the outdoor unit fan system.
(R2857)
Outdoor unit fan running?
Fan motor lead wire
connector disconnected?
Outdoor unit fan system
functioning.
Go to Check No. 15 .
NO
NO
YES
YES
Reconnect.
[Fig.1] [Fig.2]
Di s ch a rge pre ssu re check
Repl a ce compe ss or.
Open the s top v a lve.
Repl a ce the pipe in s t a lled a t
the s ite.
Cle a n.
Repl a ce the compre ss or.
At the he a t exch a nger
a nd a ir filter dirty?
I s the s top v a lve open?
I s the connection
pipe deformed?
High
YE S
YE S
NO
NO
NO
YE S
YE S
NO