INSTRUCTIONS FOR INSTALLATION
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Page
18
Central heating is
working but domestic
hot water (DHW)
is not working
Is the relay RHW
in ON possition?
Is the votage
present on DHW
pump therminals?
NO
YES
NO
Please check the following
before going through Fault
finding chart.
Check the installation is
correct.
All isolating valves are open.
The system is full of water
(pressurised) and purged of
air.
Programmer and controls
outside of boiler are on.
Check the electrical supply is
connected correctly and
present
YES
Find and restore
break of connection
Are the parameters
for DHW on
control panel or/and external
programmer
correct?
Change parameters
NO
YES
Check external
programmer
NO
Change the
relay RHW
YES
Change the DHW pump
Is the voltage
present on terminals
a1(L) and a2(N)
of relay RHW?
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