Inaccurate Temperature Control (For Both Domestic Hot Water And Space Heating Operation) - Daikin EDLQO5CAV3 Service Manual

ESIE15-08B | Part 2. Troubleshooting
Possible failures
Displayed date/time is
wrong - schedules not cor-
rectly executed.
Incorrect setting of unit
control method (setting
[C-07]).
Incorrect setting of user
interface location (user
menu [A.2.1.B]).
Incorrect setting of space
heating OFF temperature
(setting [4-02]).
Preferential kWh rate
power supply settings and
electrical connections do
not match.
Root cause category: component - electrical
Hydro PCB A1P not opera-
tional.
Reactor coil
(L1R/L2R/L3R) broken.
Root cause category: hardware
Cooling/heating operation
starts, but stops immedi-
ately.
3.5. Inaccurate temperature control (for both domestic hot water and space heating
operation)
Possible failures
Root cause category: parameter (setting)
Incorrect setting of unit control
method (setting [C-07]).
Incorrect setting of user inter-
face location (user menu
[A.2.1.B]).
Incorrect setting of pump oper-
ation mode (continuous, sam-
ple, request) (setting [F-0D]).
19/07/16
Daikin Altherma Monobloc CA
Root cause
Daylight Saving Time not
set correctly.
Incorrect setting of unit
control method (setting
[C-07]) (leaving water con-
trol, room thermostat con-
trol, ext. room thermostat
control).
Incorrect setting of user
interface location (user
menu [A.2.1.B]) (at unit/in
room).
Incorrect setting of space
heating OFF temperature
(setting [4-02]).
Preferential kWh rate
power supply settings and
electrical connections do
not match.
• No power supply.
• Faulty transformer
TR1.
• PCB malfunction.
Component problem.
• Refrigerant
overcharge.
• Mixing of air in
refrigerant system.
Root cause
Incorrect setting of unit control
method (setting [C-07]) (leav-
ing water control, room ther-
mostat control, ext. room
thermostat control).
Incorrect setting of user inter-
face location (user menu
[A.2.1.B]) (at unit/in room).
Incorrect setting.
Check
Check Daylight Saving Time settings.
Check if setting [C-07] (leaving water con-
trol, room thermostat control, ext. room
thermostat control) is in set according to
the application.
Check if setting of user interface location
(user menu [A.2.1.B]) (at unit/in room) is
set correctly.
Check if setting space heating OFF tem-
perature (setting [4-02]) is correct (keep at
35°C).
Check preferential kWh rate power supply
settings and electrical connections (see
installer reference guide).
• Confirm if a small green led is blinking
in regular intervals.
• Confirm power supply towards PCB
A1P.
• Check good operation of transformer
TR1.
Check continuity of the reactor coil.
Check refrigerant.
Check
Check if setting [C-07] (leaving
water control, room thermostat
control, ext. room thermostat
control) is in set according to
the application.
Check if setting of user inter-
face location (user menu
[A.2.1.B]) (at unit/in room) is
set correctly.
Confirm setting [F-0].
3. Symptom based troubleshooting
Corrective action
Set Daylight Saving Time
according to operation
manual.
• Re-establish power to
PCB.
Replace Hydro PCB A1P
in case power supply and
transformer TR1 are OK
but led is not blinking.
Replace the reactor coil in
case faulty.
After vacuum drying,
charge correct amount of
refrigerant.
Corrective action
Adjust setting to match appli-
cation.
Adjust setting to match appli-
cation.
Adjust setting [F-0] if required.
(Factory setting: [F-0]=1).
Page 55