T
tamarisk
Got a Baxi Bahama 100 with Honeywell controls that has recently started having problems and now keeps locking out. Sometimes it will start and run several times on the trot without any problem, then it has a spate of locking out; usually when it's gone cold. Pressing the reset button sometimes works first time but at other times it requires several reset attempts.
Only a very small flame or none at all can be seen when it fails, almost as though the gas valve is not opening enough.
So far the following have been changed due to this and other problems:-
Also
Other
Is it likely the gas valve is intermittently sticking and if so can this be fixed or does it need replacing?
Any help would be much appreciated
Only a very small flame or none at all can be seen when it fails, almost as though the gas valve is not opening enough.
So far the following have been changed due to this and other problems:-
- CVI unit (twice)
- Main PCB (however old PCB still works grrr)
- Primary (CH) flow switch
- Over temp stat (though the original one still appears OK)
- Thermistor
- Ignition electrodes (were originally cleaned but with no improvement)
- Flame sense electrode (was originally cleaned but with no improvement)
- Electrode leads
Also
- There is an ignition spark that appears the same intensity when it locks out as when the boiler fires OK, suggesting it's not a fan/air flow/switch or CVI problem.
Other
- The hot water flow switch checks out OK
- Both the CH & HW flow switch bodies have been cleaned
- The CH return gauze filter has been cleaned
- The airflow switch proves OK
- CH outlet temperature does not exceed about 60 to 70 degrees
Is it likely the gas valve is intermittently sticking and if so can this be fixed or does it need replacing?
Any help would be much appreciated
