Symptom: The Space Is Not Sufficiently Heated At Low Outdoor Temperatures; Symptom: The Pressure At The Tapping Point Is Temporarily Unusually High - Daikin Altherma R Hybrid Installer's Reference Manual

13 | Troubleshooting

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

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

Installer reference guide
178
Possible causes
Gas boiler operation is not activated
The gas boiler equilibrium temperature
has not been configured correctly
There is air in the system.
Too much heat pump capacity is used
for heating domestic hot water (applies
only to installations with a domestic hot
water tank)
Possible causes
Failing or blocked pressure relief valve.
Corrective action
Check and make sure that:
▪ The gas boiler is switched On and is
NOT in standby mode.
▪ The communication cable between
the gas boiler and the indoor unit is
properly mounted.
▪ There is no error code on the gas
boiler display.
Increase the "equilibrium temperature"
to activate gas boiler operation at a
higher outdoor temperature. Go to:
▪ [A.5.2.2] > Installer settings >
Heat sources > Boiler >
Equilibrium temp. OR
▪ [A.8] > Installer
Overview settings [5‑01]
Purge air manually or automatically. See
the air purge function in the
"Commissioning" chapter.
Check and make sure that the "space
heating priority" settings have been
configured appropriately:
▪ Make sure that the "space heating
priority status" has been enabled. Go
to [A.8] > Installer settings >
Overview settings [5‑02]
▪ Increase the "space heating priority
temperature" to activate backup
heater operation at a higher outdoor
temperature. Go
Installer settings > Overview
settings [5‑03]
Corrective action
▪ Flush and clean the complete tank
including the piping between pressure
relief valve and the cold water inlet.
▪ Replace the pressure relief valve.
CHYHBH05+08AF + EHYKOMB33A
settings >
to [A.8] >
Daikin Altherma R Hybrid
4P471761-1E – 2020.10