Section 9 - Fault Finding
111
Installation and Maintenance
FAULT FINDING
9.1.35 3-Way Valve does not Operate and No DHW
Is the DHW timer scheduled to be ON?
(Refer to DHW Daily Timer and DHW Weekly Schedule
in section 5.8.2)?
Is the DHW Target Temperature too low?
Refer to DHW in section 5.8.4.
Is there a 240 V AC power supply on the Indoor PCB
terminal 3_ 1ON?
Is there a 240 V AC supply voltage at the Indoor Control
Box, at the left-hand Overheat Stat connection?
Is there a 240 V AC supply voltage at the Indoor Control
Box, at the right-hand Overheat Stat connection?
Is there a 240 V AC supply voltage at the Indoor Control
Box, at the 3-way valve connection?
Is the wiring assembly from the Indoor Control Box,
3-way valve connection, correctly attached to the to the
3-way valve.
Replace the 3-way valve.
Set DHW so that is timed to be ON.
Increase the DHW target temperature.
Replace the Indoor PCB.
Make sure that the wire from the Indoor
PCB terminal 3_1ON to the left-hand
Overheat Stat connection is correctly
attached.
Make sure that the Overheat Stat has
not operated and that each end of
the Overheat Stat wiring assembly is
connected correctly.
Make sure that the wire from the Indoor
Control Box, Overheat Stat, right-hand
connection, is attached correctly to the
3-way valve, LIVE connection.
Make sure that the wiring assembly from
the Control Box, 3-way valve connection,
is connected correctly to the 3-way valve.
NO
YES
YES
NO
NO
NO
NO
YES
NO
NO
YES
YES
YES
YES
To Next Page