Daikin Altherma EBLQ011CA3V3 - User Interface Is Failure or Frozen Screen; Leak; Water Flow or Volume too Low; Compressor Related

1 Troubleshooting
Service manual
25
EBLQ+EDLQ011~016CAV3+W1 + EBLQ+EDLQ011~016CA3V3+W1
+ EK(2)CB07CAV3 + EKMBUHCA3V3+9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
1.5.4 User interface is failure or frozen screen
Root cause category: component – electrical
Possible failure Root cause Check Repair
Hydro PCB NOT operational. ▪ No power supply,
▪ Faulty transformer,
▪ PCB malfunction.
▪ Confirm if a small green led is
blinking in regular intervals,
▪ Confirm power supply towards
hydro PCB,
▪ Check good operation of
transformer.
▪ Re-establish power to hydro
PCB,
▪ Replace hydro PCB in case
power supply and transformer
are OK but led is NOT blinking.
Reactor coil broken. Component problem. Check continuity of the reactor coil. Replace the reactor coil in case
faulty.
P1/P2 transmission cable broken/
short-circuit.
Check P1/P2 cable (16VDC on
BRC terminals and cable
continuity).
Repair P1/P2 cable if required.
User interface failure. Replace user interface.
No display. Display contrast too high or too
low.
Adjust contrast.
Blocked screen. Mismatch between software and
EEPROM on user interface.
Power reset and user interface
reset.
1.5.5 Leak
Root cause category: installation
Possible failure Root cause Check Repair
Drain connection of water safety
valve leaking.
Bad connection between unit drain
pipe and field drain pipe.
Check the drain connection of the
water safety valve.
Correct the drain connection if
required.
Drain of bottom drain plate NOT
well connected.
Bad connection of bottom drain
plate and field drain connection.
Check the drain connection
between the bottom drain plate
and the field drain.
Correct the drain connection if
required.
Leakage of drain valve. Valve NOT completely closed. Check if drain valve is closed. Close the drain valve.
Root cause category: component – mechanical
Possible failure Root cause Check Repair
Expansion vessel NOT
pressurized.
Component failure. Check expansion vessel. Replace expansion vessel.
Safety valve blocked. Component failure. Check safety valve. Replace safety valve.
Safety valve leaking. Component failure. Check safety valve. Replace safety valve.
Leakage of drain valve. Component failure. Check drain valve. Replace drain valve.
Domestic hot water tank leakage. Component failure. Check tank visually for leakages. Repair leakages. If NOT possible,
complete unit has to be replaced.
Air Purge leakage. Component failure. Check air purge valve for
leakages.
Replace air purge valve.
1.5.6 Water flow or volume too low
1 If this symptom is determined, check the steps in error codes
7H‑xx to solve the error. See "1.4 Error based
troubleshooting"on page4.
1.5.7 Compressor related
Compressor does not start
Root cause category: software control
Possible failure Root cause Check Repair
Compressor does NOT start
because water loop temperature is
too low.
Special software control activated -
Water loop temperature is too low
(<24°C) causing ONLY the backup
heater to operate. Compressor will
start when water temperature
reaches 24°C or more.
Normal unit operation – no specific
countermeasure required.
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