Daikin EUWL KZW1 Series Service Manual page 103

ESIE-0303
Malfunction
High-pressure
switch
Flow switch or
pump contact
Discharge ther-
mal protector
Reverse phase
protection
An overview of the malfunction indications and safeties is given in "Malfunction Indications and
Safeties Overview" on page 3–7.
Part 3 – Troubleshooting
Possible causes
■ Defective condenser fan
operation in cooling
■ Dirty or blocked condenser
■ Operation out of range
■ Water flow too low in heating
■
Water temperature too high in
heating
■ Damaged flow switch
■
Incorrect pump operation
■ Incorrect field wiring
■
Defective control devices
(pump relay)
■
Refrigerant shortage
■ Operation out of range
■ Incorrect phase direction
■ One phase missing
Troubleshooting
Items to be checked
■ Operation condition
outdoor air temp. < 43°C
■ State of the condenser (clean)
■ Pump operation
■ Water flow (blocked valves)
■
Flow switch operation
■ Operation condition
leaving condenser water < 55°C
■ Flow switch
■
Pump operation
■ Field wiring
■
Control devices
■
Refrigerant leak
■ Operation condition
■ Swap two phases
■ Connect the loose phase
1
3 3
4
5
3–21