HAMWORTHY HEATING LTD
33
PUREWELL VariHeat he
500001155/F
9.0 FAULT FINDING
The Purewell Vari
Heat he
boiler is equipped with full self diagnostic fault indication, which is displayed on the
screen - refer to
section 8.7 - Controls Operation.
Should a fault occur which cannot be reset, or a fault repeatedly occurs, contact Hamworthy Heating for
assistance. Do not continue to operate or use the boiler as this may cause damage to the boiler or
controls.
9.1 Safety Features Summary
9.1.1 Safety Temperature Limiter
The electronic control thermostat has several safety levels built in such that a controlled shutdown should occur
before the safety temperature limiter is activated. Should these safety levels be overridden (say external pump
overrun failure after shutdown) the safety temperature limiter will trip initiating a boiler shutdown, preventing the
boiler from firing.
Should the control thermostat fail, causing an overheat condition, the safety temperature limiter will trip thus creating an
immediate shutdown regardless of firing mode. An overheat message on the
controls fascia
will indicate that this
condition has occurred. The safety temperature limiter is reset by depressing the reset pin protruding through the hole
near the centre of the controls fascia. If, after pushing the pin in, the display screen does not reset and the boiler does not
light up, it could be that the boiler is still too hot, i.e. the control thermostat has not re-set. An investigation should be
carried out to ascertain the reason for the overheating. An obvious reason would be too low a water flow rate through the
boiler.
The flame is under constant supervision by the burner logic controller. This is accomplished by measuring the flame's
ability to rectify an AC current. If the flame diminishes for whatever reason and the rectified current drops below the
controllers minimum (1.2µA DC), the controller will make 1 attempt to re-light. If this attempt is unsuccessful a non-volatile
lockout occurs which requires a manual re-set (‘on/off button situated on the controls fascia) to re-start the control
sequence.
If the boiler continues to lockout, then an investigation must be made to ascertain the cause - refer to section 9.3 below.
9.2 Fault Finding Procedures
General error messages are detailed in figure 8.7 to assist with fault finding . If the boiler still cannot be operated
satisfactorily after following the instructions, consult your local office of Hamworthy Heating for assistance.
9.3 Possible Causes of Boiler Lockout
1) Ignition failure due to faulty igniter.
2) Ignition failure due to faulty gas valve.
3) No ignition due to faulty controller.
4) Ignition failure due to faulty flame probe or sensing circuit.
9.4 Conditions ‘Blocking’ Operation of Boiler
1) Condensate trap blocked (differential pressure switch activated).
2) No or low gas supply pressure.
10.0 SERVICING
A competent person registered for working on non domestic gas appliances should check and ensure that the
flue, its support and terminal, the ventilation to the boiler house, safety valve, condensate trap, drain, water
filter if fitted, pressure gauge etc., are in a serviceable and working condition, and still comply with the
relevant standards and codes of practice - see Section 4 & Appendices
10.1 Regular servicing is recommended
, preferably by a Hamworthy appointed person, and at least annually, to
ensure trouble free operation.
For the Purewell Vari
Heat he,
Hamworthy would recommend an additional 6 monthly examination following
commissioning, acknowledging site conditions and running hours.
Although cleaning of flueways may not be necessary on a yearly basis inspection of the flueways must be undertaken
annually and it is important that all controls and safety features are checked for correct operation.
NOTE!
Measuring flue gas CO
2
and gas temperatures will give an indication of the state of the boiler flueways and
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