1 Troubleshooting
Service manual
29
EBLQ+EDLQ011~W1 + EBLQ+EDLQ011~0W1
+ EK(2)CB EKMB9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
Possible failure
Root cause
Check
Repair
Compressor frequency limited -
high pressure protection function
active.
In case high pressure is higher
than 38 bar the compressor
frequency will be reduced. When
the pressure drops below 36 bar
the compressor frequency can
increase again.
Activation of the protection function
can be caused by various reasons,
therefore we recommend to check
the following:
▪ Check
refrigerant
pressure
sensor,
▪ Check high pressure side plate
type heat exchanger for good
water flow and heat exchange,
▪ Check the refrigerant charge.
Based on the diagnosis execute
one of the following actions:
▪ Replace refrigerant pressure
sensor,
▪ Optimize the water flow through
the high pressure side plate type
heat exchanger,
▪ Correct the refrigerant charge.
▪ Compressor frequency limited,
▪ Suction
pipe
superheat
protection function active.
This protection control activates
when suction superheat is >10°C
and expansion valve is fully open
(480 pulse). Unit returns to normal
operation when suction superheat
is <4°C.
Remark: check the suction
superheat by measuring the
suction temperature (with contact
thermometer) before the
compressor and comparing with
the saturated evaporation
temperature.
Activation of the protection function
can be caused by various reasons,
therefore we recommend to check
the following:
▪ Check refrigerant charge,
▪ Check expansion valve for
correct operation,
▪ Check suction thermistor,
▪ Check the refrigerant circuit for
blockages.
Based on the diagnosis execute
one of the following actions:
▪ Correct the refrigerant charge,
▪ Replace expansion valve,
▪ Replace suction thermistor,
▪ Remove
detected
blockages
from the refrigerant circuit.
Root cause category: end user
Possible failure
Root cause
Check
Repair
Space heating or domestic hot
water operation is NOT activated
on the user interface.
—
Confirm if space heating operation
or domestic hot water operation is
activated on user interface.
Activate space heating or domestic
hot water operation on the user
interface.
Root cause category: parameter (setting)
Possible failure
Root cause
Check
Repair
Displayed date/time is wrong -
schedules NOT correctly executed.
▪ NOT set date/time after initial
start-up,
▪ No power supply for more than
48 hours.
Check date/setting and content of
schedules.
Set date/time according to
operation manual instructions.
Displayed date/time is wrong -
schedules NOT correctly executed.
Daylight Saving Time NOT set
correctly.
Check Daylight Saving Time
settings.
Set Daylight Saving Time
according to operation manual.
Schedules NOT activated.
Schedules were NOT confirmed
(see the schedule settings).
Check schedules on the user
interface.
Set schedule according to user
reference guide.
Holiday setting active.
Holiday setting is activated in the
user interface.
Check holiday settings.
Set holiday settings correctly.
Backup heater operation disabled. Setting backup heater operation
mode [4‑00] is set to 0 (disable).
Check setting [4‑00].
Change setting [4‑00] to 1.
Second step of the backup heater
is NOT allowed.
Setting "enable backup heater step
2" [4‑07] is set to 0 (NOT allowed).
Check setting [4‑07].
Change setting [4‑07] to 1.
Backup heater equilibrium point
was set too low.
Setting "equilibrium
temperature" [5‑01] was set too
low.
Check setting [5‑01].
Change setting [5‑01] to 0 or
higher to more quickly allow
backup heater operation.
Root cause category: installation
Possible failure
Root cause
Check
Repair
PHE condenser (partial) blockage. Dirty water (particles).
▪ Check water flow rate registered
by flow sensor,
▪ Check plate heat exchanger for
blockage.
▪ If required replace the plate heat
exchanger,
▪ Check the water quality.
3‑way valve bypass between
domestic hot water and space
heating.
3‑way valve incorrectly mounted.
Check the 3‑way valve.
Correct the position of the 3‑way
valve.
Water filter blocked.
Dirty water.
▪ Check water filter,
▪ Check water quality.
▪ Clean the water filter,
▪ Check the water quality.