ESIE15-08B
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Part 2. Troubleshooting
3. Symptom based troubleshooting
Page 54
19/07/16
Daikin Altherma Monobloc CA
3.4. The system does not start/operate
Possible failures
Root cause
Check
Corrective action
Root cause category: software control
Thermostat ON conditions
for space heating are not
met.
Thermostat ON conditions
for space heating are not
met.
Confirm thermostat on conditions depend-
ing on the unit control method (setting
C-07):
•
Setting -1: External room thermostat
indicates by contact when to start/stop.
•
Setting -2: Room thermostat control =>
compare setpoint with room thermistor
value. Thermo on: room temperature =
setpoint - (hysteresis/2).
Thermo off = room tempe
(hysteresis/2). For setting of hysteresis
refer to setting 9-0C.
•
Setting -3: Leaving water temperature
control => Thermo on: leaving water
temperature = setpoint. Thermo off:
leaving water temperature -1,5°C.
Change setpoint if
required.
Thermostat ON conditions
for domestic hot water
operation are not met.
Thermostat ON conditions
for domestic hot water
operation are not met.
Confirm thermostat on conditions depend-
ing on the selected domestic hot water
(DHW) control type (setting [6-0D]):
1. Reheat only:
In case reheat setpoint is 55°C or lower:
domestic hot water will go thermo off
when reheat setpoint (setting [6-0C]) is
reached.
Domestic hot water will go thermo on
when reheat setpoint (setting [6-0C])
-10°C is reached.
In case reheat setpoint is higher than
55°C:
domestic hot water will go thermo off
when reheat setpoint (setting [6-0C])+
(setting [7-00]) is reached.
Domestic hot water will go thermo on
when reheat setpoint (setting [6-0C]) -
(setting [7-01]) is reached.
2. Schedule only:
domestic hot water will go thermo off
when setpoint (setting [6-0A] or [6-0B])
is reached.
Domestic hot water will only go thermo
on at time of schedule demand.
3. Sc reheat
combination of 1) and 2).
Change setpoint if
required.
Out of operation range
(ambient temperature
above 35°C).
Ambient temperature
higher than 35°C.
No action - unit cannot operate when
ambient temperature is above 35°C.
Root cause category: end user
Space heating or domes-
tic 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 opera-
tion on the user interface.
Root cause category: parameter (setting)
Displayed date/time is
wrong - schedules not cor-
rectly executed.
•
Not set date/time after
initial startup.
•
No power supply for
more than 48 hours.
Set date/time according to operation man-
ual instructions.
Set date/time according to
operation manual instruc-
tions.