1 Troubleshooting
Service manual
31
EBLQ+EDLQ011~W1 + EBLQ+EDLQ011~0W1
+ EK(2)CB EKMB9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
Possible failure
Root cause
Check
Repair
Backup heater operation disabled
(setting [4‑00] is set to 0).
Setting backup heater operation
mode [4‑00] is set to 2 (ONLY
domestic hot water).
Check setting [4‑00].
Change setting [4‑00] to 1.
Setting domestic hot water
operation mode [6‑0D] NOT set
optimally.
Setting domestic hot water
operation mode [6‑0D] is set to 0
(reheat ONLY). This will cause the
system to work too frequently in
domestic hot water operation and
less in space heating.
Check setting [6‑0D].
It is advisable to set to factory
setting ( schedule) and
program the schedule to heat the
domestic hot water during periods
of no space heating required.
Root cause category: installation
Possible failure
Root cause
Check
Repair
3‑way valve does NOT switch
correctly between space heating
connection and domestic hot water
connection.
3‑way valve incorrectly mounted.
Check the 3‑way valve.
Correct the position of the 3‑way
valve.
Root cause category: component – electrical
Possible failure
Root cause
Check
Repair
3‑way valve blocked.
Component failure.
Check the 3‑way valve.
Replace the 3‑way valve.
Root cause category: system design
Possible failure
Root cause
Check
Repair
Water circuit – requested capacity
too high.
Incorrect system selection.
Check required capacity by heat
load calculation. See the capacity
tables in the engineering data
book to know max. system
capacity at indicated conditions.
Adapt system design.
Water circuit - water volume too
big.
▪ Long water piping,
▪ Too many heating emitters.
Check required capacity by heat
load calculation. See the capacity
tables in the engineering data
book to know max. system
capacity at indicated conditions.
Adapt system design.
Water circuit - pressure drop too
big.
▪ Too small water piping,
▪ Too long water piping,
▪ Too many heating emitters.
Compare the pressure drop of the
total system with the water pump
characteristics (See check of water
pump). Decreased water flow will
cause a drop in capacity.
Adapt system design.
1.5.12
Inaccurate temperature control
Root cause category: parameter (setting)
Possible failure
Root cause
Check
Repair
Incorrect setting of unit control
method (setting [C‑07]).
Incorrect setting of unit control
method (setting [C‑07]) (leaving
water control, room thermostat
control, ext. room thermostat
control).
Check if setting [C‑07] (leaving
water control, room thermostat
control, ext. room thermostat
control) is set according to the
application.
Adjust setting to match application.
Incorrect setting of pump operation
mode (continuous, sample,
request) (setting [F‑0D]).
Incorrect setting.
Confirm setting [F‑0].
Adjust setting [F‑0] if required.
(Factory setting: [F‑0]=1).
Root cause category: installation
Possible failure
Root cause
Check
Repair
User interface – thermostat sensor
value NOT representing room
temperature.
Bad location of thermostat sensor
(external influence) in case of
room thermostat control (setting
[C‑07]=2).
Check if user interface is mounted
in the correct position to measure
the correct room temperature.
Correct the position of the user
interface for more accurate room
temperature measurement.