ESIE15-08B
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Part 2. Troubleshooting
3. Symptom based troubleshooting
19/07/16
Page 57
Daikin Altherma Monobloc CA
3.7. Power consumption too high
Possible failures
Root cause
Check
Corrective action
Root cause category: end user
Too high domestic hot water
setpoint.
User set too high domestic hot
water setpoint by schedule or
manual operation.
Check domestic hot water tank
set temperature; avoid electric
heater use.
Adapt domestic hot water set-
point (e.g. 50-55°C).
Too high leaving water temper-
ature setpoint.
User set too high leaving water
temperature setpoint by
schedule or manual operation.
Check leaving water setpoint.
Adapt leaving water setpoint
(e.g. < 55°C will reduce
backup heater operation).
Too high space heating set-
point on room thermostat.
User set too high room set-
point by schedule or manual
operation.
Check room thermostat set-
point.
Adapt room thermostat set-
point.
Root cause category: parameter (setting)
Too high leaving water temper-
ature (LWT) - weather depend-
ent.
Incorrect weather dependent
setting --> too high LWT limit
set [A.3.1.1.3] [A.3.1.2.3].
Check LWT high limit in
weather dependent (setting
[1-03]).
Adapt high LWT limit for
weather dependent heating
(setting [1-03]).
User interface thermostat used
with setting [A.2.1.7] on value
1 (= external thermostat con-
trol).
Wrong setting of [A.2.1.7] -
unit control method.
Check setting [A.2.1.7].
Adjust setting to match appli-
cation - refer to installers refer-
ence guide.
Pump keeps running all the
time during space heating
operation.
Wrong setting of [A.2.1.9] -
pump operation.
Check pump operation mode
setting [F-0D].
Change setting [F-0D] from
continuous operation (value 0)
to Sample (1) or Request (2).
Refer to installer reference
guide for applicable value.
Setting disinfection operation
day [2-00] was set to 0 (each
day).
Setting disinfection operation
day [2-00] was set to 0 (each
day).
Check setting [2-00].
Adjust setting if necessary.
Unit is running in emergency
operation and is using backup
heater only.
[4-06] is set to 1.
Unit is running in emergency
operation and is using backup
heater only.
[4-06] is set to 1.
Check setting [4-06].
Adjust setting if necessary.
Backup heater equilibrium
point was set too high.
Setting "equilibrium tempera-
ture" [5-01] was set too high.
Check setting [5-01].
Change setting [5-01] to less
quickly allow backup heater
operation.
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 fre-
quently in domestic hot water
operation and less in space
heating.
Check setting [6-0D] in combi-
nation with the re-heat setpoint
[6-0C].
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: component - electrical
Deviation of backup heater
outlet thermistor will influence
the backup heater control.
•
Deviation of backup heater
outlet thermistor (lower
temperature measured
than actual).
• Bad
contact
between
sensor and pipe.
Check backup heater outlet
thermistor (see page 70).
If required replace backup
heater outlet thermistor or
PCB A1P.
Root cause category: system design
Water circuit - requested
capacity too high causing the
system always to run at full
capacity.
Incorrect system selection.
Check required capacity by
heat load calculation. Refer to
the capacity tables in the engi-
neering data book to know
max. system capacity at indi-
cated conditions.
Adapt system design.
