29
6.7
D.H.W. MODE - FAULT FINDING
Start from cold - rotary switch set to SUMMER position, D.H.W. thermostat set to maximum, and all D.H.W. taps OFF.
Is there power
at the external
socket?
Make
power
available
Open any tap.
Is there an
adequate flow
rate of D.H.W.
available?
Does
the fan
start?
Is fuses
at mains
plug OK?
Clean or replace
the water flow
switch
Is there voltage
available
to the fan?
Replace fuses in
mains plug
Replace
the fan
Check the
power supply
cable
Does the boiler
lock-out without
starting the
burner?
The boiler
lock-out
starting
the burner
Is there a spark
at the ignition
electrode?
Is the ionization
probe connected
to the main PCB
and the ground?
Check the
gas supply
Check for continu-
ity between ignition
electrode and igni-
tion transformer
The gap between
ignition electrode
and hood
is correct?
Fit correctly the
ignition electrode
Is the gas
available?
Restore the
connection
Check the
connection of
gas valve on
the control board
PCB
Is there voltage at
the gas valve?
Replace the
gas valve
Yes
No
No
Yes
No
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
No
Yes
No
No
No
Yes
No
Yes
Verify that the
safety
thermostat
is working
correctly?
Replace the
thermostats
No
Is the
connection of
the safety
thermostat
correct?
Reset the
connection
No
Yes
Yes
No
Verify that the
safety
thermostat
is working
correctly?
Yes
Check the
connection of
the thermostat
Replace the
thermostat
No
Summary of Contents for Format B
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