Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 1088

FDC-HKXR
4) Heating operation does not start
valve control relays
Is AC 200V applied
at shunt controller connector
Defective SVH (high
pressure gas side solenoid
valve) → Replace.
1086
NO
Is heat
outputted?
YES
(1)
NO
Are solenoid
Defective relay → Replace.
OK?
YES
NO
CnB?
YES
Defective indoor unit PCB → Replace.
→
Defective relay (XH) Replace.
Note (1) This is applicable only when a concentrated
shunt controller is used.