Hamworthy Warmwell 60 Installation, Commissioning And Servicing Instructions page 41

Figure 12.2b Fault Finding Procedures (Cont.)
Continued
Does the burner light at Low
Fire ?
Yes
Is there a demand for High
Fire ? Neon N8 illuminated E
on main PCB.
Yes
Does the boiler operate at
High fire ?
Yes
Boiler at high fire but
cycles on/off rapidly.
No
Boiler at high fire but
overheats while system
remains cool
No
Boiler at high fire but
operates noisily.
No
Boiler operates
satisfactorily
HAMWORTHY HEATING LTD
Is the flame signal from the
No
probe above the minimum
(0.7uA) ?
Is there power at the
gas valve ?
Replace the gas valve
No
Is there a demend from
the thermostat ?
Is the High/Low link fitted,
terminals (3 - 4)CN16 ?
Has High Fire airflow been
No
detected ? Neon N12
illuminated on main PCB.
Is there power at the High
Fire gas valve solenoid ?
Replace the gas valve
Yes
Temperature control circuit
faulty
Poor water circulation
Yes
Insufficient water circulation
Yes
Insufficient water circulation
Temperature control set
too high
Temperature control circuit
faulty
Scale build up in boiler
waterways.
Gas control valve faulty
Boiler gas setting pressure
incorrect
WARMWELL
No
Yes
No
Yes
No
Yes
No
No
E
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
35
Check the probe wiring
Check the gas valve
plug and wiring
Turn the thermostat to
maximum.
Check C16 terminal N
wiring. Check B.E.M.S
load requirements
Check High Fire Air
Pressure Switch,
electrical connections and
sensing tubes.
Check gas valve plug and
wiring to main PCB Cn12.
Check/replace temperature
sensor and/or boiler PCB
Check/replace pump, bleed
trapped air from the system
Check/replace pump, bleed
air from system
Check/replace pump, bleed
air from the system
Adjust temperature control
to a lower setting
Check/replace temperature
sensor and/or boiler PCB
Descale boiler
Check/replace gas valve
Check/adjust gas pressure
at manifold
500001091/F