ESIE09-08A 3-Way Valve
Appendix 277
Check if signal
towards 3-way
valve is correct
1. Disconnect 3-way valve wiring from terminal
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.
2. If wiring is correct and output voltages of X2M are
correct but motor does not turn when switching
from one operation mode to another, replace 3-way
valve motor.
In space heating mode:
X2M: 3-4: 0V, X2M: 3-5: 230V, X2M: 4-5: 230V
In DHW mode:
X2M: 3-4: 230V, X2M: 3-5: 230V, X2M: 4-5: 0V
0V 230V
230V
230V 230V
0V
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