ESIE15-08B
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Part 2. Troubleshooting
2. Error code based troubleshooting
19/07/16
Page 21
Daikin Altherma Monobloc CA
2.3. “AH-00” – Disinfection operation error
2.4. “AJ-03” – Domestic hot water heat duration is too long (warning)
Trigger
Effect
Reset
Disinfection setpoint is not reached or not
kept at required temperature long enough.
Unit will continue operating.
Auto-reset when next disinfection is com-
pleted.
Possible cause
Check
Corrective action
Large hot water quantity has been tapped
during / before disinfection.
Check when the disinfection is scheduled
(schedule it when there is little chance
that water will be tapped so that the disin-
fection can finish in time).
Adjust schedule timer and/or related set-
tings. Refer to the Installer Reference
Guide.
Backup heater is restricted during disin-
fection.
Check the backup heater settings [4-00]
till [4-04]. Refer to the Installer Reference
Guide.
Adjust related settings. Refer to the
Installer Reference Guide.
Faulty water tank thermistor R5T.
Check thermistor R5T (see page 70).
Replace thermistor R5T when required
(see page 124).
Tank setting not OK.
Check settings regarding tank.
Change settings.
Backup heater not allowed.
Check setting backup heater (e.g. [4-00]).
Change settings.
Faulty hydro PCB A1P.
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
Check if hydro PCB A1P receives power.
Adjust the power to the PCB.
Replace hydro PCB A1P when alive led is
not blinking in regular intervals.
Adjust software of hydro PCB A1P or
install correct spare part when required.
Faulty extension PCB A4P.
Check PCB A4P (see page 86).
Check if the correct spare part is installed.
Replace extension PCB A4P when
required.
Booster heater not allowed.
Check all electrical heater related settings
(e.g.[4-00])
Change settings when required.
Trigger
Effect
Reset
DHW heat-up > 6 hours.
Unit switches to space heating for 3
hours.
Automatic reset via user interface.
Possible cause
Check
Corrective action
Faulty backup heater.
Check backup heater (see page 65).
Replace backup heater when required.
Faulty or disturbance of the power supply.
(Imbalance > 10%) Power drop.
Short circuit.
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Adjust power supply when required.
Power reset via outdoor unit.
Blown fuse.
Check fuses on PCB's.
Replace fuses when required.
Too large DHW consumption.
Lower DHW consumption.
Faulty 3-way valve.
Check 3-way valve (see page 84).
Replace 3-way valve when required.
Leaking field installed DHW tap.
Check installation. Refer to Installer Ref-
erence Guide.
Fix the leak.
Backup heater not allowed.
Check setting backup heater (e.g. [4-00]).
Change settings of backup heater.
Mismatch between software ID and EEP-
ROM on the hydro PCB A1P or User
Interface
Confirm if the software and EEPROM on
hydro PCB A1P [Menu structure 6.8.2]
and User Interface [Menu structure 6.8.1]
correspond with the detailed information
given in the Update work instruction.
Update hydro PCB A1P and User Inter-
face again, do not forget to select "Reset
to factory settings" at the beginning of the
update procedure.
Faulty booster heater.
Check booster heater (see page 69).
Replace the booster heater
when required
(see Installer reference guide of the water
tank).
Booster heater not allowed.
Check all electrical heater related settings
(e.g.[4-00])
Change settings when required.
