Water Leakage Or Water Release Via The Water Pressure Relieve Valve - Daikin EDLQO5CAV3 Service Manual

ESIE15-08B | Part 2. Troubleshooting
Possible failures
Root cause category: installation
User interface - thermostat
sensor value not representing
room temperature.
Root cause category: component - electrical
Leaving water thermistor devi-
ation causes incorrect temper-
ature control.
Deviation of domestic hot
water tank thermistor.
(Remark: only valid for inaccu-
rate domestic hot water tem-
perature control.)
User interface (A2P) - thermo-
stat sensor has incorrect read-
ing of room temperature.

3.6. Water leakage or water release via the water pressure relieve valve

Possible failures
Root cause category: installation
Drain connection of water
safety valve leaking.
Drain of bottom drain plate not
well connected.
Leakage of drain valve.
Root cause category: component - mechanical
Expansion vessel not pressu-
rized.
Safety valve blocked.
Safety valve leaking.
Leakage of drain valve.
Domestic hot water tank leak-
age.
Air Purge leakage.
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Daikin Altherma Monobloc CA
Root cause
Bad location of thermostat
sensor (external influence) in
case of room thermostat con-
trol (setting [C-07]=2).
• Deviation of thermistor
(lower temperature
measured than actual).
• Bad contact between
sensor and pipe.
• Deviation of thermistor.
• Bad contact between
sensor and pipe.
Deviation of user interface
room temperature sensor.
Root cause
Bad connection between unit
drain pipe and field drain pipe.
Bad connection of bottom
drain plate and field drain con-
nection.
Valve not completely closed.
Component failure.
Component failure.
Component failure.
Component failure.
Component failure.
Component failure.
3. Symptom based troubleshooting
Check
Check if user interface is
mounted in the correct position
to measure the correct room
temperature.
Check leaving water thermis-
tor (see page 70).
Check thermistor DHW tank
thermistor (see page 70).
Compare temperature meas-
ured by user interface with
actual room temperature.
Check
Check the drain connection of
the water safety valve.
Check the drain connection
between the bottom drain
plate and the field drain.
Check if drain valve is closed.
Check expansion vessel.
Check safety valve.
Check safety valve.
Check drain valve.
Check tank visually for leak-
ages.
Check air purge valve for leak-
ages.
Corrective action
Correct the position of the user
interface for more accurate
room temperature measure-
ment.
Replace leaving water ther-
mistor or hydro PCB A1P.
Replace DHW tank thermistor
or hydro PCB A1P.
In case of deviation the room
temperature offset can be
adjusted through setting
[2-0A].
Corrective action
Correct the drain connection if
required.
Correct the drain connection if
required.
Close the drain valve.
Replace expansion vessel.
Replace safety valve.
Replace safety valve.
Replace drain valve.
Repair leakages. If not possi-
ble, complete unit has to be
replaced.
Replace air purge valve.
19/07/16