Symptom: User Interface Is Failure Or Frozen Screen; Symptom: Leak - Daikin altherma 3 M Service Manual

2 | Troubleshooting

2.4.4 Symptom: User interface is failure or frozen screen

Possible failure
Hydro PCB NOT
operational.
Reactor coil broken.
P1/P2 transmission cable
broken/short-circuit.
User interface failure.
No display.
Blocked screen.

2.4.5 Symptom: Leak

Possible failure
Drain connection of water
safety valve leaking.
Drain of bottom drain plate
NOT well connected.
Leakage of drain valve.
Possible failure
Expansion vessel NOT
pressurized.
Safety valve blocked.
Safety valve leaking.
Leakage of drain valve.
Service manual
70
Root cause category: component – electrical
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 interface.
Root cause category: installation
Root cause
Bad connection between
unit drain pipe and field
drain pipe.
Bad connection of bottom
drain plate and field drain
connection.
Valve NOT completely
closed.
Root cause category: component – mechanical
Root cause
Component failure.
Component failure.
Component failure.
Component failure.
Check
▪ Confirm if a small green
led is blinking in regular
intervals,
▪ Confirm power supply
towards hydro PCB,
▪ Check good operation of
transformer.
Check continuity of the
reactor coil.
Check P1/P2 cable
(16 V DC on BRC terminals
and cable continuity).
Check user interface
software version.
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
Check expansion vessel.
Check safety valve.
Check safety valve.
Check drain valve.
Repair
▪ Re-establish power to
hydro PCB,
▪ Replace hydro PCB 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.
Update user interface
software to the latest
version. If problem
persists, replace the user
interface.
Adjust contrast.
Power reset and user
interface reset.
Repair
Correct the drain
connection if required.
Correct the drain
connection if required.
Close the drain valve.
Repair
Replace expansion vessel.
Replace safety valve.
Replace safety valve.
Replace drain valve.
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03