To assemble the gas boiler ............................................................................................................................................. 202

13 Troubleshooting

13.1

Overview: Troubleshooting ............................................................................................................................................ 204

13.2

Precautions when troubleshooting ................................................................................................................................ 204

13.3

Solving problems based on symptoms........................................................................................................................... 205

13.3.1

Symptom: The unit is NOT heating or cooling as expected........................................................................... 205

13.3.2

Symptom: The compressor does NOT start (space heating or domestic water heating) ............................ 206

13.3.3

Symptom: The pump is making noise (cavitation)......................................................................................... 206

13.3.4

Symptom: The pressure relief valve opens.................................................................................................... 206

13.3.5

Symptom: The water pressure relief valve leaks........................................................................................... 207

13.3.6

Symptom: The space is NOT sufficiently heated at low outdoor temperatures........................................... 207

13.3.7

Symptom: The pressure at the tapping point is temporarily unusually high................................................ 208

13.3.8

Symptom: Tank disinfection function is NOT completed correctly (AH-error)............................................. 208

13.3.9

Symptom: Boiler abnormality detection (HJ-11 error).................................................................................. 209

13.3.10 Symptom: Boiler/hydrobox combination abnormality (UA-52 error)........................................................... 209

13.3.11 Symptom: The burner does NOT ignite ......................................................................................................... 209

13.3.12 Symptom: The burner ignites noisily ............................................................................................................. 210

13.3.13 Symptom: The burner resonates ................................................................................................................... 210

13.3.14 Symptom: No space heating by the gas boiler .............................................................................................. 210

13.3.15 Symptom: The power is reduced ................................................................................................................... 211

13.3.16 Symptom: Space heating does NOT reach the temperature ........................................................................ 211

13.3.17 Symptom: Hot water does NOT reach the temperature (no tank installed) ................................................ 211

13.3.18 Symptom: Hot water does NOT reach the temperature (tank installed) ..................................................... 211

13.4

Solving problems based on error codes ......................................................................................................................... 212

13.4.1

Error codes: Overview .................................................................................................................................... 212

14 Disposal

14.1

Overview: Disposal.......................................................................................................................................................... 220

14.2

To pump down ................................................................................................................................................................ 220

14.3

To start and stop forced cooling..................................................................................................................................... 221

15 Technical data

15.1

Piping diagram: Outdoor unit ......................................................................................................................................... 222

15.2

Piping diagram: Indoor unit ............................................................................................................................................ 223

15.3

Wiring diagram: Outdoor unit ........................................................................................................................................ 224

15.4

Wiring diagram: Indoor unit ........................................................................................................................................... 225

15.5

Wiring diagram: Gas boiler ............................................................................................................................................. 231

15.6

ESP curve: Indoor unit..................................................................................................................................................... 232

15.7

Technical specifications: Gas boiler................................................................................................................................ 233

15.7.1

General ........................................................................................................................................................... 233

15.7.2

Energy-related products specifications ......................................................................................................... 235

15.7.3

Appliance category and supply pressure ....................................................................................................... 236

16 Glossary

17 Field settings table

Table of contents

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