ESIE98–06A Troubleshooting
Part 3 – Troubleshooting 3–21
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An overview of the fault indications and safeties is given in ‘Overview of Fault Indications and Safeties’
on page 3-7.
High pressure
switch
■ water flow too low in heating
■ water temperature too high in
heating
■ defective condenser fan
operation in cooling
■ dirty or blocked condenser
■ operation out of range
■ pump operation
■ water flow (blocked valves)
■ flow switch operation
■ operation condition
outdoor air temperature < 43 °C
leaving condenser water < 25 °C
■ state of the condenser (clean)
Flow switch or
pump contact
■ damaged flow switch
■ incorrect pump operation
■ incorrect field wiring
■ defective control devices
(pump relay)
■ flow switch
■ pump operation
■ field wiring
■ control devices
Discharge ther-
mal protector
■ Refrigerant shortage
■ Operation out of range
■ Refrigerant leak
■ Operation condition
Fan thermal
protector
■ Blocked fan
■ Blocked condenser
■ State of the fans (free rotation)
■ State of the condenser
Reverse phase
protection
■ Incorrect phase direction
■ One phase missing
■ Swap two phases
■ Connect the loose phase
Problem Possible causes Items to be checked
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