Daikin ALTHERMA HT EKBUHAA6 V3, Service Manual

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ESIE09-08A Troubleshooting by Indication on the Remote Controller
Troubleshooting 143
3.2
“A6”
Indoor Unit: Pump Error (M1P) or Other Water System
Error
Remote Control
Display
A6
Subcode 0
Applicable Models All indoor unit models
Method of
Malfunction
Detection
Detection by failure of signal for detecting number of turns to come from the pump motor. Detection by
failure ref. sensors.
Malfunction
Decision Conditions When number of turns cannot be detected even when output voltage to the pump motor is maximum.
When water sensors are not within expected range.
Supposed Causes

Pump rotor locked

Disconnected or faulty wiring between pump connector and PC board (A1P)

Blocked waterflow or heat exchanger (waterside)
Troubleshooting
Caution
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
Connect the wiring and turn on again.
Fix the wiring and turn on again.
YES
NO
NO
NO
NO
NO
YES
YES
Replace the indoor unit PC board.
Replace the pump motor.
(V2779)
Is the
wiring from the
pump securely connected
to connectors (X20A) on the
indoor unit PC board?
(A1P)
Wiring
between the indoor
unit PC board and pump is
disconnected.
Does the pump run?
YES
Can be checked - Too high T° difference
|Return water
- R-134a liquid T°|>40°C
|Leaving water T° - condense temp|>15°C
- Too small T° difference
|Leaving water - return water temp|<1°C
Is the
waterflow or heat
exchanger
blocked?
YES
Make sure all valves are open.
Make sure filter is not clogged.
Make that sure water pressure is OK
(0,3bar<P<3bar).
Make sure that all valves are open.
Make sure that all air is out of the system.
Is the pump
rotor locked?