A6" Indoor Unit: Pump Error (M1P) Or Other Water System Error - Daikin ALTHERMA HT Service Manual

ESIE09-08B
"A6 " Indoor Unit: Pump Error (M1P) or Other Water
3.2
System Error
A6
Remote Control
Display
Subcode 0
All indoor unit models
Applicable
Models
Detection by failure of signal for detecting number of turns to come from the pump motor.
Method of
Detection by failure ref. sensors.
Malfunction
Detection
When number of turns cannot be detected even when output voltage to the pump motor is
Malfunction
maximum. When water sensors are not within expected range.
Decision
Conditions
 Pump rotor locked
Supposed
 Disconnected or faulty wiring between pump connector and PC board (A1P)
Causes
 Blocked waterflow or heat exchanger (waterside)
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Caution
YES
Is the pump
rotor locked?
NO
Is the
YES
waterflow or heat
Can be checked - Too high T° difference
exchanger
|Return water
blocked?
|Leaving water T° - condense temp|>15°C
NO
|Leaving water
Is the
wiring from the
NO
pump securely connected
Connect the wiring and turn on again.
to connectors (X20A) on the
indoor unit PC board?
(A1P)
YES
Wiring
between the indoor
YES
Fix the wiring and turn on again.
unit PC board and pump is
disconnected.
NO
YES
Does the pump run? Replace the indoor unit PC board.
NO
Replace the pump motor.
Troubleshooting by Indication on the Remote Controller
Make sure all valves are open.
Make sure filter is not clogged.
- R-134a liquid T°|>40°C
- Too small T° difference
- return water temp|<1°C
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.
(V2779)
133