15 | Troubleshooting
Installer reference guide
198
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620242-1 – 2020.06
15 Troubleshooting
In this chapter
15.1 Overview: Troubleshooting .................................................................................................................................................... 198
15.2 Precautions when troubleshooting........................................................................................................................................ 198
15.3 Solving problems based on symptoms................................................................................................................................... 199
15.3.1 Symptom: The unit is NOT heating or cooling as expected .................................................................................. 199
15.3.2 Symptom: The compressor does NOT start .......................................................................................................... 200
15.3.3 Symptom: The system is making gurgling noises after commissioning................................................................ 200
15.3.4 Symptom: The pump is blocked............................................................................................................................. 201
15.3.5 Symptom: The pump is making noise (cavitation) ................................................................................................ 201
15.3.6 Symptom: The pressure relief valve opens ........................................................................................................... 202
15.3.7 Symptom: The water pressure relief valve leaks................................................................................................... 202
15.3.8 Symptom: The space is NOT sufficiently heated at low outdoor temperatures .................................................. 203
15.4 Solving problems based on error codes................................................................................................................................. 203
15.4.1 To display the help text in case of a malfunction.................................................................................................. 203
15.4.2 Error codes of the unit ........................................................................................................................................... 204
15.1 Overview: Troubleshooting
This chapter describes what you have to do in case of problems.
It contains information about:
▪ Solving problems based on symptoms
▪ Solving problems based on error codes
Before troubleshooting
Carry out a thorough visual inspection of the unit and look for obvious defects such
as loose connections or defective wiring.
15.2 Precautions when troubleshooting
WARNING
▪ When carrying out an inspection on the switch box of the unit, ALWAYS make
sure that the unit is disconnected from the mains. Turn off the respective circuit
breaker.
▪ When a safety device was activated, stop the unit and find out why the safety
device was activated before resetting it. NEVER shunt safety devices or change
their values to a value other than the factory default setting. If you are unable to
find the cause of the problem, call your dealer.
DANGER: RISK OF ELECTROCUTION
WARNING
Prevent hazards due to inadvertent resetting of the thermal cut-out: power to this
appliance MUST NOT be supplied through an external switching device, such as a
timer, or connected to a circuit that is regularly turned ON and OFF by the utility.
DANGER: RISK OF BURNING/SCALDING
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