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9 Trouble shooting
Only instructed persons are allowed to correct failures and to change the settings The controller basic ad-
justment takes place in the context of commissioning via the specialist! The operator and contractual partner
is responsible for further corrections and program settings!
Malfunction/display
Heating system is not
warm,
no malfunction
Heat pump heats only
hot water and does not
heat, or heats too late
Hot water temperature
not reached or no
longer reached
Heat pump runs contin-
uously and only pro-
vides low temperatures,
traces of oil in appliance
Er.91
flow rate too low
No hot water or heating
system remains cold.
9.1 Error Codes OTE
BA OCHSNER AQUA TERRA_EN_V01.1.docx
Cause
1. Utility black-out
2. Energy supply to the
heating circuits is inter-
rupted or too low
3. Loss of electricity
4. Hot water priority
Hot water desired setting is too
high
Legionella switching
Circulation pipework
Hot water heat exchanger
chalked up
Hot water heat exchanger too
small
Heat exchanger is chalked up
Wrong sensor positioning
Pipework to small
Hot water sensor defect
Hot water charge pump defect
Water charge pump perfor-
mance stage too low
3-way valve defect
Refrigerant leakage
Refrigerant circuit not sealed
The min. flow rate not reached
on the heat pump.
Loss of power
Table 2:
Remedy
Check individual room controls, bleed heat-
ing circuits,
open valves,
check circulation pumps, increase setting
on circulation pump
Check fuses/circuit breakers
Check hot water settings
Use timer program
Install E-rod for hot water
Reduce flow and use timer
Contact heating installer, clean and decal-
cify heat exchanger
Increase heat exchanger size
Decalcify heat exchanger
Correct positioning
Fit larger pipes
Replace
Replace
Set performance stage higher
Replace
Switch off heat pump, contact customer
service
System pressure too low,
check pressure maintenance equipment.
Buffer charge pump defect,
Changeover valve defect
Check the reason
Switch fuses/circuit breakers back on.
Trouble shooting
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