After some quick advice... Sorry for the lengthy post.
We have had issues with our Prima F40 boiler overheating over the last couple of months... Just as we are about to move house (exchange is imminent - handy)!
Last year we had a similar issue and
- Replaced the shut of valves to the F&E tank (it was overfilling)
- Fitted a new pump (it was old and struggling, noisy)
- Drained and refilled with fernox cleaner, re drained and refilled with inhibitor
This was done through British Gas Homecare which we no longer have as it is a load of rubbish - they can't get parts which are easily available through plumbers merchants). There was a lot of air in the system which required a lot of bleeding etc. over the following week or two.
All seemed fine over the winter. Once in a blue moon the boiler has been tripping on the overheat for the last few months (maybe since the beginning of March once every two weeks or so). Last night this re-occurred but the pump was running after the boiler had tripped (sounded faster than normal) which we had not noticed before.
The only work we had done before this was the fitting of a new flue as the terminal guard had corroded to make sure it was compliant (yes all done by a gas safe guy). The airing cupboard, pump, valves etc were not touched as part of this process.
Current Settings:
Boiler: Set to "2"
Thermostat: set to about 18 degrees at the moment
Programmer: Heating and water set to come on at 6:00 and off at 8:30, on at 5:00 and off at 9:30
Pump: Set to "1" of the the 3 fixed speed settings (there are options for variable speed or constant flow rate and 1, 2, 3 fixed speed)
Observations so far:
- 3 port valve seems to be working happily (switching between HW, CH and both as called for).
- After pushing in the overheat switch on the boiler we cannot recreate the fault, it runs fine!
- Pump is running fine (although I wonder if setting 1 is too slow, it is more noisy on setting 2).
- I switched between speeds last night before deciding to leave it as it is so as not to cause more issues today while not in the house, it worked on settings 1 and 2 but 2 was a bit "wooshy"
- feed and expansion tank was fine, filled enough but not overfilled.
- I bled the valve in the airing cupboard last night
General observations:
- Sometimes the boiler will take a few clicks and fan whirrs before it fires on, most of the time it fires first time.
- My wife informs me that the boiler sounded like it was struggling to fire this morning (I was fast asleep)
I intend to bleed the rads this evening and see if that helps
If this does not resolve things what is my next step? It's very hard to pinpoint what the issue is!
We have had issues with our Prima F40 boiler overheating over the last couple of months... Just as we are about to move house (exchange is imminent - handy)!
Last year we had a similar issue and
- Replaced the shut of valves to the F&E tank (it was overfilling)
- Fitted a new pump (it was old and struggling, noisy)
- Drained and refilled with fernox cleaner, re drained and refilled with inhibitor
This was done through British Gas Homecare which we no longer have as it is a load of rubbish - they can't get parts which are easily available through plumbers merchants). There was a lot of air in the system which required a lot of bleeding etc. over the following week or two.
All seemed fine over the winter. Once in a blue moon the boiler has been tripping on the overheat for the last few months (maybe since the beginning of March once every two weeks or so). Last night this re-occurred but the pump was running after the boiler had tripped (sounded faster than normal) which we had not noticed before.
The only work we had done before this was the fitting of a new flue as the terminal guard had corroded to make sure it was compliant (yes all done by a gas safe guy). The airing cupboard, pump, valves etc were not touched as part of this process.
Current Settings:
Boiler: Set to "2"
Thermostat: set to about 18 degrees at the moment
Programmer: Heating and water set to come on at 6:00 and off at 8:30, on at 5:00 and off at 9:30
Pump: Set to "1" of the the 3 fixed speed settings (there are options for variable speed or constant flow rate and 1, 2, 3 fixed speed)
Observations so far:
- 3 port valve seems to be working happily (switching between HW, CH and both as called for).
- After pushing in the overheat switch on the boiler we cannot recreate the fault, it runs fine!
- Pump is running fine (although I wonder if setting 1 is too slow, it is more noisy on setting 2).
- I switched between speeds last night before deciding to leave it as it is so as not to cause more issues today while not in the house, it worked on settings 1 and 2 but 2 was a bit "wooshy"
- feed and expansion tank was fine, filled enough but not overfilled.
- I bled the valve in the airing cupboard last night
General observations:
- Sometimes the boiler will take a few clicks and fan whirrs before it fires on, most of the time it fires first time.
- My wife informs me that the boiler sounded like it was struggling to fire this morning (I was fast asleep)
I intend to bleed the rads this evening and see if that helps
If this does not resolve things what is my next step? It's very hard to pinpoint what the issue is!