Symptom: The Water Pressure Relief Valve Leaks; Symptom: The Space Is Not Sufficiently Heated At Low Outdoor Temperatures; Symptom: The Pressure At The Tapping Point Is Temporarily Unusual High; Symptom: Decoration Panels Are Pushed Away Due To A Swollen Tank - Daikin ERLQ004CA Installer's Reference Manual

12.3.5 Symptom: The water pressure relief valve
leaks
Possible causes
Dirt is blocking the water
pressure relief valve outlet
12.3.6 Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes
The backup heater operation is
not activated
The backup heater equilibrium
temperature has not been
configured correctly
Too much heat pump capacity is
used for heating domestic hot
water (applies only to
installations with a domestic hot
water tank)
EHBH04+08 + ERLQ004~008
Daikin Altherma - Low Temperature Split
4P313774-1 – 2012.05
Corrective action
Check whether the pressure
relief valve works correctly by
turning the red knob on the valve
counterclockwise:
If you do NOT hear a
clacking sound, contact your
dealer.
If the water keeps running
out of the unit, close both
the water inlet and outlet
shut-off valves first and then
contact your dealer.
Corrective action
Check and make sure that:
The backup heater
operation mode is enabled.
Go to:
[A.5.1.1] > Installer
settings > Heat sources
> Backup heater
Operation mode OR
[A.8] > Installer settings
> Overview settings [5-
01]
The thermal protector of the
backup heater has not been
activated. If it has, check:
The water pressure
Whether there is air in
the system
The air purge operation
Press the reset button in the
switch box. See
"15.3 Components" on page 74
for the location of the reset
button.
Increase the "equilibrium
temperature" to activate the
backup heater operation at a
higher outdoor temperature. Go
to:
[A.5.1.4] > Installer settings
> Heat sources > Backup
heater > Equilibrium temp.
OR
[A.8] > Installer settings >
Overview settings [4-00]
Check and make sure that the
"space heating priority" settings
have been configured
appropriately:
Make sure that the "space
heating priority status" has
been enabled. Go to [A.8] >
Installer settings > Overview
settings [5-02]
Increase the "space heating
priority temperature"
activate backup heater
operation at a higher
outdoor temperature. Go to
[A.8] > Installer settings >
Overview settings [5-03]
12.3.7 Symptom: The pressure at the tapping point
is temporarily unusual high
Possible causes
Failing or blocked pressure relief
valve.
12.3.8 Symptom: Decoration panels are pushed
away due to a swollen tank
Possible causes
Failing or blocked pressure relief
valve.
12.4

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.

12.4.1 Error codes: Overview

Error codes of the indoor unit
Detailed error
Error code code
A1 00
AA 01
UA 00
7H 01
89 01
8H 00
8F 00
C0 00
7H 02
U3 00
81 00
C4 00
80 00
to
U5 00
U4 00
12 Troubleshooting
Corrective action
Flush and clean
complete tank including the
piping between pressure
relief valve and the cold
water inlet.
Replace the pressure relief
valve.
Corrective action
Contact your local dealer.
Description
Zero cross detection problem.
Power reset required.
Please contact your dealer.
Backup heater overheated.
Power reset required.
Please contact your dealer.
Indoor unit, outdoor unit
matching problem.
Power reset required.
Water flow problem.
Heat exchanger frozen.
Abnormal increase BUH outlet
water temperature.
Abnormal increase BUH outlet
water temperature (DHW).
Flow sensor/switch malfunction.
Please contact your dealer.
Water circuit pressure is too high.
Under floor heating screed dryout
function not completed correctly.
Leaving water temperature
sensor problem.
Please contact your dealer.
Heat exchanger temperature
sensor problem.
Please contact your dealer.
Returning water temperature
sensor problem.
Please contact your dealer.
User interface communication
problem.
Indoor/outdoor unit
communication problem.
Installer reference guide
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the