Overview: Troubleshooting .................................................................................................................................................... 256

14.2

Precautions when troubleshooting........................................................................................................................................ 256

14.3

Solving problems based on symptoms................................................................................................................................... 257

14.3.1

Symptom: The unit is NOT heating or cooling as expected .................................................................................. 257

14.3.2

Symptom: Hot water does NOT reach the desired temperature ......................................................................... 258

14.3.3

Symptom: The compressor does NOT start (space heating or domestic water heating) .................................... 258

14.3.4

Symptom: The system is making gurgling noises after commissioning................................................................ 258

14.3.5

Symptom: The pump is making noise (cavitation) ................................................................................................ 259

14.3.6

Symptom: The pressure relief valve opens ........................................................................................................... 259

14.3.7

Symptom: The water pressure relief valve leaks................................................................................................... 260

14.3.8

Symptom: The space is NOT sufficiently heated at low outdoor temperatures .................................................. 260

14.3.9

Symptom: The pressure at the tapping point is temporarily unusually high ....................................................... 261

14.3.10 Symptom: Decoration panels are pushed away due to a swollen tank................................................................ 261

14.3.11 Symptom: Tank disinfection function is NOT completed correctly (AH-error) .................................................... 261

14.4

Solving problems based on error codes................................................................................................................................. 262

14.4.1

To display the help text in case of a malfunction.................................................................................................. 262

14.4.2

Error codes: Overview............................................................................................................................................ 263

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.

WARNING

▪

When carrying out an inspection on the switch box of the unit, ALWAYS make