Potterton Flamingo RS40 Installation And Service Manual page 28

Page 20
Service Section – Page 21
CONDITION
D. Main burner fails to shut
down when water reaches
predetermined temperature
(3) Honeywell Control solenoid
valve failed.
POSSIBLE CAUSE
(4) Thermostat out of
calibration or faulty
(5) Blocked main burner
injector
(1) Thermostat out of
calibration or faulty.
(2) Dirt on valve seat of
Honeywell control.
Check solenoid using
procedure given in Figure
If solenoid valve has failed;
replace as described in A(3).
REMEDY
Check thermostat using
procedure given in Figure
If faulty, replace thermostat as
detailed in Maintenance
Instructions, Section7 .f.
Clean or replace injection as
detailed in Maintenance
Instructions Section 7.a.
Remedy as in item C(4).
Clean the valve seat as
follows:-
(a) Remove the solenoid valve
and the plate beneath as
described in A(3).
(b) Clean the valve seat and
the valve chamber.
(C) Re-assemble in the
reverse order.
16.
17.