Pump Related; Water Pump Behaviour; User Interface (No Or Strange Display) - Daikin EDLQO5CAV3 Service Manual

ESIE15-08B | Part 2. Troubleshooting

3.12. Pump related

3.12.1. Water pump behaviour

Possible failures
Root cause category: software control
Unexpected water pump
behaviour
Root cause category: parameter (setting)
Incorrect setting of pump oper-
ation mode (continuous, sam-
ple, request) (setting [F-0D])

3.13. User interface (no or strange display)

Possible failures
Root cause category: component - electrical
Hydro PCB A1P not opera-
tional
Reactor coil (L1R/L2R/L3R)
broken
P1P2 transmission cable bro-
ken/short-circuit
User interface failure
No display
Blocked screen.
No 'busy' message during
start-up
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Daikin Altherma Monobloc CA
Root cause
Water pump software control
Incorrect setting
Root cause
• No power supply
• Faulty transformer
• PCB malfunction
Component problem
Display contrast too high or
too low
Mismatch between software
and EEPROM on user inter-
face
3. Symptom based troubleshooting
Check
Water pump start/stop condi-
tions:
• During space heating or
domestic hot water off: the
pump is off
• During space heating or
domestic hot water on:
pump operation depends
on setting [F-0D]
(continuous, sample or
request)
Remark: in domestic hot water
operation the pump starts later
than the compressor to avoid
that the tank is cooled down by
the cold water loop.
Confirm setting [F-0]
Check
• Confirm if a small green led
is blinking in regular
intervals
• Confirm power supply
towards hydro PCB A1P
• Check good operation of
transformer
Check continuity of the reactor
coil
Check P1P2 cable (16 VDC
on BRC terminals and cable
continuity)
Replace user interface
Check setting [7.1.1]
Corrective action
Adapt setting [F-0] if required
(factory setting: [F-0]=1)
Corrective action
• Re-establish power to
hydro PCB A1P
• Replace hydro PCB A1P in
case power supply and
transformer are OK but led
is not blinking
Replace the reactor coil in
case faulty
Repair P1/P2 cable if required
Adjust contrast
Power reset and user interface
reset.
19/07/16