Potterton Flamingo RS40 Installation And Service Manual page 27

B. Main burner fails to light and
pilot is extinguished when
pressure on the button is
released,
C. Main burner fails to light,
pilot burning.
5) Igniter generator not
working
(6) Electrode or lead damaged. (a) Replace electrode or lead
(1) Control button not held
down long enough.
(2) Loose thermocouple
connection into control valve,
(3) Pilot rate too low.
(4) Partially blocked pilot filter
or pilot injector.
(5) Failure of thermocouple,
power unit or latching
mechanism
(1) Boiler thermostat set to 'off'
or low setting
(2) Additional controls not
calling for heat
Check that the striker and
plunger mechanism is
operating correctly. If the
operating mechanism is
correct, proceed as follows:-
(a) Disconnect the igniter lead
from the generator, then place
the stripped end of a suitable
piece of insulated wire in the
generator; hold the other end
of the wire close to the boiler
waterway, then operate the
generator and check if a spark
is made. If no spark appears,
replace the generator. If a
spark is made but it does not
spark at electrode: replace
electrode.
as detailed in Maintenance
Instructions, Section 7.c or 7.h.
Control button must be fully
pressed down for 20 seconds
before main valve can be
energised.
Tighten thermocouple union
nut finger tight plus ¼ turn
only. Ensure connection is
clean and dry. TOO MUCH
PRESSURE MAY DAM AGE
INSULATION AND CAUSE
FAILURE.
Adjust the pilot flame, see
Section 6.
As item A(3) and A(4).
After pilot has been on for 20
seconds, release control
button. If pilot light goes out:-
(a) Check F.F.D. and
thermocouple using procedure
given in Fig. 15.
(b) If thermocouple has failed,
replace as described in
Maintenance Instructions,
Section7.d.
Note setting of thermostat dial
and check temperature of flow
pipe.
Check programmer or clock is
'ON' and that room thermostat
or other distant control is not
closed down. Carry out
preliminary electrical system
checks.