Daikin Altherma 3 HT - Troubleshooting; Precautions During Troubleshooting

14 | Troubleshooting
Installer reference guide
242
EPRA14~18D + ETVH/X16S18+23E
Daikin Altherma 3 H HT F
4P644737-1A – 2022.03
14 Troubleshooting
In this chapter
14.1 Overview: Troubleshooting .................................................................................................................................................... 242
14.2 Precautions when troubleshooting ........................................................................................................................................ 242
14.3 Solving problems based on symptoms................................................................................................................................... 243
14.3.1 Symptom: The unit is NOT heating or cooling as expected .................................................................................. 243
14.3.2 Symptom: Hot water does NOT reach the desired temperature ......................................................................... 244
14.3.3 Symptom: The compressor does NOT start (space heating or domestic water heating) .................................... 244
14.3.4 Symptom: The system is making gurgling noises after commissioning................................................................ 244
14.3.5 Symptom: The pump is blocked............................................................................................................................. 245
14.3.6 Symptom: The pump is making noise (cavitation) ................................................................................................ 246
14.3.7 Symptom: The pressure relief valve opens ........................................................................................................... 246
14.3.8 Symptom: The water pressure relief valve leaks................................................................................................... 247
14.3.9 Symptom: The space is NOT sufficiently heated at low outdoor temperatures .................................................. 247
14.3.10 Symptom: The pressure at the tapping point is temporarily unusually high ....................................................... 248
14.3.11 Symptom: Tank disinfection function is NOT completed correctly (AH-error) .................................................... 248
14.4 Solving problems based on error codes................................................................................................................................. 249
14.4.1 To display the help text in case of a malfunction .................................................................................................. 249
14.4.2 Error codes of the unit ........................................................................................................................................... 249
14.1 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.
14.2 Precautions when troubleshooting
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING
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.