Daikin R32 Split Series - Solving Problems Based on Symptoms; Symptom: Hot Water Does NOT Reach the Desired Temperature; Symptom: the Pressure at the Tapping Point Is Temporarily Unusually High; Symptom: Tank Disinfection Function Is NOT Completed Correctly (AH-Error)

14 | Troubleshooting
Installer reference guide
102
EKHWET90~120BAV3
R32 Split series – Domestic hot water tank
4P680077-1 – 2021.11
14.3 Solving problems based on symptoms
14.3.1 Symptom: Hot water does NOT reach the desired temperature
Possible causes Corrective action
One of the tank temperature sensors is
broken.
See the service manual of the unit for
the corresponding corrective action.
14.3.2 Symptom: The pressure at the tapping point is temporarily unusually high
Possible causes Corrective action
Failing or blocked pressure relief valve. ▪ Flush and clean the complete tank
including the piping between pressure
relief valve and the cold water inlet.
▪ Replace the pressure relief valve.
14.3.3 Symptom: Tank disinfection function is NOT completed correctly (AH-error)
Possible causes Corrective action
The disinfection function was
interrupted by domestic hot water
tapping
Program the start-up of the disinfection
function when the coming 4hours NO
domestic hot water tapping is expected.
Large domestic hot water tapping
happened recently before the
programmed start-up of the disinfection
function
If in [5.6] Tank > Heat up mode the
mode Reheat only or Schedule +
reheat is selected, it is recommended
to program the start-up of the
disinfection function at least 4hours
later than the last expected large hot
water tapping. This start-up can be set
by installer settings (disinfection
function).
If in [5.6] Tank > Heat up mode the
mode Schedule only is selected, it is
recommended to program a Eco action
3hours before the scheduled start-up
of the disinfection function to preheat
the tank.
The disinfection operation was stopped
manually: [C.3] Operation > Tank was
turned off during disinfection.
Do NOT stop tank operation during
disinfection.
14.4 Solving problems based on error codes
If the unit runs into a problem, the user interface displays an error code. It is
important to understand the problem and to take measures before resetting an
error code. This should be done by a licensed installer or by your local dealer.
This chapter gives you an overview of most possible error codes and their
descriptions as they appear on the user interface.