Overview: Troubleshooting .................................................................................................................................................... 218

13.2

Precautions when troubleshooting........................................................................................................................................ 218

13.3

Solving problems based on symptoms................................................................................................................................... 219

13.3.1

Symptom: The unit is NOT heating or cooling as expected .................................................................................. 219

13.3.2

Symptom: Hot water does NOT reach the desired temperature ......................................................................... 220

13.3.3

Symptom: The compressor does NOT start (space heating or domestic water heating) .................................... 220

13.3.4

Symptom: The system is making gurgling noises after commissioning................................................................ 220

13.3.5

Symptom: The pump is blocked............................................................................................................................. 221

13.3.6

Symptom: The pump is making noise (cavitation) ................................................................................................ 221

13.3.7

Symptom: The pressure relief valve opens ........................................................................................................... 222

13.3.8

Symptom: The water pressure relief valve leaks................................................................................................... 222

13.3.9

Symptom: The space is NOT sufficiently heated at low outdoor temperatures .................................................. 223

13.3.10 Symptom: The pressure at the tapping point is temporarily unusually high ....................................................... 224

13.3.11 Symptom: Tank disinfection function is NOT completed correctly (AH-error) .................................................... 224

13.4

Solving problems based on error codes................................................................................................................................. 224

13.4.1

To display the help text in case of a malfunction.................................................................................................. 225

13.4.2

Error codes: Overview............................................................................................................................................ 225

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