Daikin ALTHERMA HT Service Manual page 277

ESIE09-08B
Check if signal
towards 3-way
1. Disconnect 3-way valve wiring from terminal
valve is correct
2. If wiring is correct and output voltages of X2M
Appendix
X2M:2-3-4. Check with a voltmeter if the
voltages on X2M:3-4-5 correspond with
reference value in different operation modes. If
not, replace main PCB A1P.
are correct but motor does not turn when
switching from one operation mode to another,
replace 3-way valve motor.
In space heating mode:
0V 230V
230V
X2M: 3-4: 0V, X2M: 3-5: 230V, X2M: 4-5: 230V
In DHW mode:
230V 230V
0V
X2M: 3-4: 230V, X2M: 3-5: 230V, X2M: 4-5: 0V
3-Way Valve
265