12.0
Servicing the Boiler
36
© Baxi Heating UK Limited 2005
12.1
Annual Servicing
IMPORTANT: When servicing ensure that both the gas
and electrical supplies to the boiler are isolated before
any work is started.
“The boiler cannot be switched off at the boiler,
therefore it is important to isolate the electrical supply at
the mains fuse.”
Hazardous materials are not used in the construction of
Baxi products, however reasonable care during service is
recommended.
When replacing the combustion box door after servicing
it is essential that the retaining screws are tightened fully.
1. For reasons of safety and economy, it is recommended
that the boiler is serviced annually. Before servicing please
read Section 1.2 Important Information.
2. After servicing, complete the relevant Service Interval
Record section of the Benchmark Commissioning
Checklist at the rear of this publication.
3. Ensure that the boiler is cool.
4.
Ensure that both the gas and electrical supplies to the
boiler are isolated.
5. Remove the outercase and lower door panel (see
Fitting the Outercase, Section 11.0 in reverse).
WARNING: The PCB Control and Fan
Assembly is 325 Vdc. Isolate at supply before
access.
6. Release the four
1
/
4
turn screws securing the air box
door panel and remove the door (Fig. 40).
7. Disconnect the three lead terminals from the
combustion box door taking note of their positions
(Fig. 40).
8. Undo the four screws securing the combustion box
door and remove the door (Fig. 41).
9. Visually check for debris/damage and clean or replace if
necessary the following:
a) Burner
(Fragile (133 model) - handle with care).
b) Heat exchanger fins.
c) Fan compartment
(Check also for condensate leaks).
d) Insulation.
e) Door seals -
Important: Pay particular attention to
the condition of the combustion box door seals.
f) Electrodes.
g) The condensate trap must be thoroughly cleaned at
every service (see section 13.24 for removal).
NOTE: If necessary remove the trap drain plug and
place a vessel underneath to catch the condensate
(care should be taken as this could be hot). Clean
the trap and refit the drain plug. Check for leaks.
h) Top of heat exchanger.
NOTE: General cleaning can be undertaken using a
vacuum. However debris should only be gently
blown off the burner skin due to its fragile nature
(133 HE Plus).
10. Check system pressure is between 1 and 2.5 bar.
Flue Elbow
Lead Terminals
Fig. 40
Air Box
Door Panel
Fig. 41
Combustion Box
Door Panel
Combustion Box
Door Securing
Screw
1
/
4
Turn
Screw
