3-Way Valve ESIE09-08A
274 Appendix
7.2 Troubleshooting Overview 3-Way Valve
Symptom Possible cause Check
Space heating circuit temperature
rises when unit is operating in
DHW.
DHW temperature rises when unit
is operating in space heating.
The 3-way valve sleeve is not
positioned correctly.
Verify if 3-way valve motor and
body are installed correctly (see
page 276).
Unit is working in space heating
mode but 3-way valve is positioned
in DHW mode (right instead of left
position).
Unit is working in DHW mode but
3-way valve is positioned in space
heating mode (left instead of right
position).
The 3-way valve motor is
incorrectly wired to the indoor unit.
Jumpers settings on the 3-way
valve motor PCB are incorrect.
Verify if 3-way valve motor is
wired and set up correctly (see
page 276).
3-way valve motor does not turn. The 3-way valve motor is
incorrectly wired to the indoor unit.
The indoor main PCB is broken.
The 3-way valve motor is broken.
Verify if 3-way valve motor is
wired and set up correctly (see
page 276).
Verify if the hydrobox sends out
the right signal to the 3-way valve
(see page 277).
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