13.3.16 Symptom: The Power Is Reduced; Symptom: Space Heating Does Not Reach The Temperature; Symptom: Hot Water Does Not Reach The Temperature (No Tank Installed); Temperature (Tank Installed) - Daikin CHYHBH05AA Installer's Reference Manual

13.3.16 Symptom: The power is reduced

Possible causes
At high rpm, the power has fallen
by more than 5%.
13.3.17 Symptom: Space heating does NOT reach
the temperature
Possible causes
Weather-dependent setpoint
setting is incorrect.
Temperature is too low.
No circulation in the installation.
The boiler power has NOT been
correctly set for the installation.
No heat transfer as a result of
lime scale or fouling in the heat
exchanger.
13.3.18 Symptom: Hot water does NOT reach the
temperature (no tank installed)
Not applicable for Switzerland
Possible causes
Domestic hot water flow is too
high.
Temperature setting for water
circuit is too low.
No heat transfer as a result of
lime scale or fouling in the heat
exchanger domestic hot water
side.
Cold water temperature <10°C.
The domestic hot water
temperature fluctuates between
hot and cold.
13.3.19 Symptom: Hot water does NOT reach the

temperature (tank installed)

Possible causes
The gas boiler has an error code. Check the display of the gas
The indoor unit has an error
code.
CHYHBH05+08AA + EHYKOMB33A
Daikin hybrid for multi heat pump – heat pump module
4P471761-1A – 2017.10
Corrective action
▪ Check the appliance and flue
system for fouling.
▪ Clean the appliance and flue
system.
Corrective action
Check the setting on the user
interface and adjust if necessary.
Increase the space heating
temperature.
Check whether there is
circulation. At least 2 or 3
radiators MUST be open.
Adjust the power. See "Maximum
space heating power setting" on
page 65.
Descale or flush the heat
exchanger on the space heating
side.
Corrective action
Adjust the inlet assembly.
Increase the domestic hot water
setpoint on the domestic hot
water homepage of the user
interface.
Descale or flush the exchanger
domestic hot water side.
The water inlet temperature is
too low.
▪ The flow is too low. To
guarantee comfort, a minimum
water flow of 5 l/min
recommended.
▪ Increase the domestic hot
water setpoint on the domestic
hot water homepage of the
user interface.
Corrective action
boiler for more information.
Check for possible errors on the
indoor unit.
Possible causes
The 3-way valve is not working
correctly.
13.4 Solving problems based on error
codes
When a problem happens, an error code appears on the user
interface. It is important to understand the problem and to take
countermeasure before resetting the error code. This should be
done by a licensed installer or by your local dealer.
This chapter gives you an overview of all error codes and the
content of the error code as it appears on the user interface.
For a more detailed troubleshooting guideline for each error, please
see the service manual.
13.4.1

Error codes: Overview

Error codes of the indoor unit
Error code Detailed error
code
7H 01
7H 04
7H 05
7H 06
80 00
is
81 05
81 00
81 04
89 01
13 Troubleshooting
Corrective action
▪ Check the installation of the 3-
way valve.
▪ In case of domestic hot water
operation, the flow should be
directed to the tank.
Description
Water flow problem.
Water flow problem during
domestic hot water production.
Manual reset.
Check the domestic hot water
circuit.
Water flow problem during
heating/sampling.
Manual reset.
Check the space heating/cooling
circuit.
Water flow problem during
cooling/defrost.
Manual reset.
Check the plate heat exchanger.
Returning water temperature
sensor problem.
Please contact your dealer.
Loosehanging tank
temperature sensor
Leaving water temperature
sensor problem.
Please contact your dealer.
Leaving water temperature
sensor not properly mounted.
Heat exchanger frozen.
Installer reference guide
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