Daikin ERLQ004~008CAV3 Reference Manual Download Page 72

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12 Troubleshooting

Installer reference guide

ERLQ004~0 EHVH/X04+0 EHVH/X08S26CA

Daikin Altherma - Low Temperature Split

4P313775-1C – 2012.11

12.2.6

Symptom: The space is NOT sufficiently
heated at low outdoor temperatures

Possible causes

Corrective action

The backup heater operation is
not activated

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 80
for the location of the reset
button.

The backup heater equilibrium
temperature has not been
configured correctly

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]

Too much heat pump capacity is
used for heating domestic hot
water (applies only to
installations with a domestic hot
water tank)

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]

12.2.7

Symptom: The pressure at the tapping
point is temporarily unusual high

Possible causes

Corrective action

Failing or blocked pressure relief
valve.

▪ Flush and clean the complete

tank including the piping
between pressure relief valve
and the cold water inlet.

▪ Replace the pressure relief

valve.

12.2.8

Symptom: Decoration panels are pushed
away due to a swollen tank

Possible causes

Corrective action

Failing or blocked pressure relief
valve.

Contact your local dealer.

12.2.9

Symptom: Tank disinfection function is
NOT completed correctly (AH-error)

Possible causes

Corrective action

The disinfection function was
interrupted by domestic hot water
tapping

Program the start-up of the
disinfection function when the
coming 4 hours NO domestic hot
water tapping is expected.

Large domestic hot water tapping
happened recently before the
programmed start-up of the
disinfection function

When the Domestic hot water >
Setpoint mode > Reheat or
sched. is selected, it is
recommended to program the
start-up 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  >
Setpoint mode > 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.

12.3

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.

12.3.1

Error codes: Overview

Error codes of the outdoor unit

Error code

Detailed error
code

Description

OU: High pressure cooling/Peak

cut/ freeze protection problem.

Please contact your dealer.

OU: PCB defect.