Daikin Altherma HT - Troubleshooting Overview 3-Way Valve

3-Way Valve ESIE09-08B
262 Appendix
8.2 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 ope
rating 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 264).
Unit is working in space heating
mode bu
t 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 264).
3-way valve motor does not
turn.
The 3-way valve motor is
in
correctly 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 264).
Verify if the hydrobox sends out
the right signal to the 3-way
valve (see page 265).