FAULT FINDING
44
europa
--- Installation & Servicing
67 FAULT FINDING
WARNING
Care must be taken when conducting fault finding tests to
guard against the risk of electric shock.
230 Vac is the nominal UK supply voltage. This may vary
between 253 Vac and 196 Vac.
When checking continuity ensure power is off to the
appliance.
With a fast pulse showing on LED 1 the boiler will continue to
operate with a reduced performance in some fault conditions.
Before commencing fault finding please check the following:
Are all wiring connections OK ?
Are the function selector settings correct
(Refer to frame 26, 27 and 30)
Are the p.c.b. jumpers correctly placed (Refer to frame 53)
yes
no
Continued on page
46 of fault finding.
Adjust the burner
pressure. refer to frame
26. Can 11.7 mbar be
achieved?
(10.5 mbar for
europa
232
)
Continued from
page 48.
Remove the motor
assembly, with 230V at
the connections is the
spindle visible? Refer
to frame 66.
Dismantle the DHW
detector valve. Refer to
frame 58 and clean.
When re---assembled
with DHW taps closed,
does the heating flow
pipe become warm?
Continued on page
45 of fault finding.
no
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no
no
no
no
no
no
no
yes
yes
yes
yes
yes
yes
yes
yes
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yes
yes
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yes
yes
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yes
no
yes
START
Ensure the room thermostat (if fitted) and programmer are calling for heat
Also that all services are on and the selector switch is set to heating*
Is the green LED on
front facia flashing?
(1 Second on, 1
Second off)
Is the green LED on
front facia flashing4
times per second?
Is there 230V between
Live and Earth at the
mains connection in
the control box?
Rectify external
wiring fault
Is there continuity
across the fuse on the
PCB # 1?
Replace faulty
external fuse and
check for wiring
fault
With the boiler in
heating mode, is the
maximum burner
pressure 11.7 mbar
(10.5 for
europa
232
) with boiler and
system cool)
Is the gas inlet
pressure > 17 mbar?
Rectify gas supply fault
Is there 230V at the
Live connection to PCB
#1 pin 4?
Repair or replace
wiring fault
Is there 16V dc at Grey
and Black connections
on modulator coil?
Replace faulty PCB #1
Is modulator harness
continuity O.K?
Repair or replace
faulty wiring
Replace faulty PCB
#1
Adjust max ’stop’ on Gas
Valve to achieve 11.7 mbar
(10.5 mbar for
europa 232
)
Does the heating
flow pipe become
warm quickly?
Is it a
system
boiler?
Is there a
DHW tap
open?
Disconnect DHW
flow sensor wiring.
Does the heating
flow pipe now
become warm?
Is there 230V
between Blue
and Brown at
the 3---way
valve
connection?
Close
DHW
tap
Is the continuity
of the 3---way
valve harness
O.K?
Repair or
replace
faulty
wiring
Replace faulty
PCB #1
Replace faulty
motor assembly
Replace faulty valve
body assembly
Replace the DHW flow
detector sensor body.
Does the heating flow
become warm?
Faulty sensor now
replaced
Replace the faulty
DHW detector
valve
FA
U
LT
F
IN
D
IN
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