IDEAL MINI C24, Установка и обслуживание

Страница: 48 / 60

FAULT FINDING
48 Mini --- Installation & Servicing
69 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 29, 30 and 33)
Pay attention that if the boiler locks out five times in an hour, it
is not sufficient to press the reset button to re---start the boiler
but it is necessary to disconnect the boiler from the main
supply and, after reconnect it, to press the reset button.
yes
no
Continued on page
50 of fault finding.
Adjust the burner
pressure. refer to
frame 29. Can the max
burner pressure* be
achieved?
Continued
from page 52.
Remove the motor
assembly, with 230V at
the connections is the
spindle visible? Refer
to frame 68.
Dismantle the DHW
detector valve. Refer to
frame 60 and clean.
When re---assembled
with DHW taps closed,
does the heating flow
pipe become warm?
Continued on page
49 of fault finding.
no no
no
no
no
no no no no no
no no
no
no
no
no no
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes yes
yes
yes
yes
yes
yes
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*
Are only the two
green leds on front
fascia flashing
together or
alternately?
Is there at least one of
the led flashing?
Is there 230V between
Live and Earth at the
mains connection in
the control box?
Rectify external
wiring fault
Is there continuity
across the fuses on
the PCB?
Replace faulty fuses
and check for wiring
fault
With the boiler in heating
mode, what is the
maximum burner
pressure with boiler and
system cool ?
(pressure values are
given in Table 2 page 4
Is the gas inlet
pressure > 17 mbar?
Rectify gas supply fault
Is there 230V at the
Live connection to PCB
pin 4?
Repair or replace
wiring fault
Is there at least 15V dc
at the connections on
modulator coil?
Replace faulty PCB
Is modulator harness
continuity O.K?
Repair or replace
faulty wiring
Replace faulty PCB
Adjust max ’stop’ on Gas
Valve to achieve the max
burner pressure*
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
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
* see Table 2 at page 4 for the correct value
Are only the two green
leds on front fascia
flashing alternatively?
yes
no
Wait 60 seconds
FA
UL
T
F
IND
ING