13 Troubleshooting
Installer reference guide
85
RVLQ05+08CAV4 + RHYHBH05AA + RHYHBH/X08AA +
RHYKOMB33AA
ROTEX HPU hybrid
4P355635-1 – 2013.05
Error code Detailed error
code
Description
AA 01 Backup heater overheated.
Power reset required.
Please contact your dealer.
UA 00 Indoor unit, outdoor unit
matching problem.
Power reset required.
7H 01 Water flow problem.
89 01 Heat exchanger frozen.
8H 00 Abnormal increase outlet
water temperature.
8F 00 Abnormal increase outlet
water temperature (DHW).
C0 00 Flow sensor/switch malfunction.
Please contact your dealer.
U3 00 Under floor heating screed
dryout function not completed
correctly.
81 00 Leaving water temperature
sensor problem.
Please contact your dealer.
C4 00 Heat exchanger temperature
sensor problem.
Please contact your dealer.
80 00 Returning water temperature
sensor problem.
Please contact your dealer.
U5 00 User interface
communication problem.
U4 00 Indoor/outdoor unit
communication problem.
EC 00 Abnormal increase tank
temperature.
HC 00 Tank temperature sensor
problem.
Please contact your dealer.
CJ 02 Room temperature sensor
problem.
Please contact your dealer.
Error code Detailed error
code
Description
H1 00 External temperature
sensor problem.
Please contact your dealer.
HJ 08 Water circuit pressure
is too high.
HJ 09 Water circuit pressure is
too low.
HJ 10 Water pressure sensor problem.
Please contact your dealer.
HJ 11 Boiler abnormality detection
Check boiler
Refer to boiler manual
HJ 12 Bypass valve turning error
Please contact your dealer.
89 02 Heat exchanger frozen.
A1 00 EEPROM reading error.
AH 00 Tank disinfection function not
completed correctly.
89 03 Heat exchanger frozen.
UA 52 Boiler/hydrobox combination
abnormality
U6 36 Boiler standby abnormality
INFORMATION
In case of error code AH and no interruption of the
disinfection function occurred due to domestic hot water
tapping, following actions are recommended:
▪ When the Domestic hot water > Type > Reheat or
Reheat + sched. 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).
▪ When the Domestic hot water > Type > Scheduled only
is selected, it is recommended to program a Storage
eco 3 hours before the scheduled start-up of the
disinfection function to preheat the tank.
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