Hamworthy Wessex 100 M100 Installation, Commissioning And Servicing Instructions page 27

Figure 12.2a Fault Finding Procedures
Initial Start Procedure
Is the fan running ?
Yes
Continued
Ref Fig 12.2b
HAMWORTHY HEATING LTD
No
Is mains power on ?
Yes
Is the temperature limiter
reset ? (Indicated on the
fascia as Overheat)
Yes
Is there a demand from the
thermostat ?
Yes
Is remote control link
(C1-C2) secure ?
Yes
Has the ignition
controller reset ?
Yes
Has the air pressure
switch proved ?
Yes
Is there a glow at the HSI
probe ?
Yes
Is there power at the
ignition controller ?
Yes
Is 'Fan On' neon
illuminated on fascia ?
Yes
Replace ignition
controller
WESSEX 100 M
No
No
No
No
No
No
No
No
No
21
Check fuse(s) time clock
etc.
Re-set temperature
limiter (Limit Stat)
Check and turn
thermostat to maximum.
Check and close
remote circuit.
Re-set ignition
controller (Lockout
button on fascia).
Check thermostats.
Check air sensing venturi
and pressure switch
connecting tubes.
Check that the probe and
electrode connections are
secure and sound.
Check wiring
Check fan motor and
air pressure switches
500001080/F