I have a Saunier Duval Thermaclassic F24E PLUS (fanned flue combiboiler GCNo 47-920-37), which was installed less than 3 years ago. (I no longer wish to use that 'engineer'.
It was on timer, water and radiators - the red lock out light was activated by a code 05 fault - overheat fault. I managed to reset the overheat thermostat and reactivated the boiler, it was very noisy and produced a code 14 - over temp on primary water circuit.
Now the patter on trial is - I activate boiler, green light comes on, ignition lights the gas, boiler makes noises, temperature goes up rapidly, boiler ceases to heat at max temp (green light still on) then shows temp rising to 99 degrees C (also the pressure increases), then red lock out light and code 14 again. If I turn power off/on I am able to repeat this procedure without resetting the overheat thermostat.
From reading postings on this site, I think it is 'kettling' which could mean the pump (I have put pump on constant which made no difference), a build up of limescale/sludge or perhaps even the heat exchange itself.
I am hoping there is something simple and cheap that I have overlooked.
I have bled the radiators and there was a massive airlock in one of them. I would be very grateful for any help ... and so would my family! [/b]
It was on timer, water and radiators - the red lock out light was activated by a code 05 fault - overheat fault. I managed to reset the overheat thermostat and reactivated the boiler, it was very noisy and produced a code 14 - over temp on primary water circuit.
Now the patter on trial is - I activate boiler, green light comes on, ignition lights the gas, boiler makes noises, temperature goes up rapidly, boiler ceases to heat at max temp (green light still on) then shows temp rising to 99 degrees C (also the pressure increases), then red lock out light and code 14 again. If I turn power off/on I am able to repeat this procedure without resetting the overheat thermostat.
From reading postings on this site, I think it is 'kettling' which could mean the pump (I have put pump on constant which made no difference), a build up of limescale/sludge or perhaps even the heat exchange itself.
I am hoping there is something simple and cheap that I have overlooked.
I have bled the radiators and there was a massive airlock in one of them. I would be very grateful for any help ... and so would my family! [/b]