ESIE15-08B
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Part 2. Troubleshooting
3. Symptom based troubleshooting
19/07/16
Page 53
Daikin Altherma Monobloc CA
3.3. Capacity shortage - Domestic hot water operation
I
NFORMATION
"Capacity shortage - General" on page 49
for an overview of the general causes (both for space heating and
domestic hot water) which can lead to capacity shortage.
Possible failures
Root cause
Check
Corrective action
Root cause category: end user
Too low domestic hot water
setpoint.
User set too low domestic hot
water setpoint by schedule or
manual operation.
Check domestic hot water tank
set temperature in combina-
tion with boiler volume and hot
water usage.
Adapt domestic hot water set-
point (e.g. 50-55°C).
(Remark: check the weather
dependent settings (relation
outdoor temperature - set-
point) in case weather
dependent control is acti-
vated.)
Domestic hot water not acti-
vated.
Check if domestic hot water
heating is activated.
Root cause category: parameter (setting)
Setting domestic hot water
operation mode [6-0D] not set
optimally.
Setting domestic hot water
operation mode [6-0D] is set to
2 (scheduled only).
Check setting [6-0D].
In case schedule only is used
assure that the programmed
schedule is inline with the tim-
ings hot water is required.
Adapt the schedules when
necessary.
Root cause category: installation
3-way valve does not switch
correctly between space heat-
ing connection and domestic
hot water connection.
3-way valve incorrectly
mounted.
Check the 3-way valve (see
page 84).
Correct the position of the
3-way valve.
Root cause category: component - electrical
3-way valve blocked.
Component failure.
Check the 3-way valve (see
page 84).
Replace the 3-way valve.
Deviation of tank thermistor.
Tank thermistor measures a
higher temperature than actual
(component failure).
Check tank thermistor (see
page 70).
Replace tank thermistor.
