Hello all - inevitably, now it''s getting colder, the boiler is playing up.
We have always had pretty low water pressure, and I have learnt that sometimes the boiler goes off (or maybe fails to come back on again) and the water pressure shows as off the scale low. I know what to do about this: there are two taps under the boiler, and I turn them both on, watch the little needle go up to the middle of the black area and turn them both off again. Then I press the pilot light button for a while and generally all is well.
A couple of weeks ago I thought I''d be clever. Rather than wait for the pressure to be too low, I thought I would top it up a bit. But when I went to look at the boiler, the little needle was showing off the scale too high! I was alarmed and tried to find out how to let some pressure out but couldn''t. I ignored it.
Now from time to time it goes off again - pressure shows low. I let some water in, start it again, and all is fine except that the pressure goes way up again by itself.
Please can someone advise me? I really can''t afford to get someone in to look at it, and it''s not as though I can''t get it started again, but it is worrying me
- because it goes off
- because the pressure fluctuates wildly between all the way down and all the way up to the top of the red area (there are no numbers on the scale).
And advice would be very welcome - in this as in so many things I feel completely out of my depth. (Just changed phone and tariff to save money and inevitably what was meant to be a smooth transition hasn''t happened at all and I feel like weeping). In court next week as well and feeling totally overwhelmed and depressed (not to mention repossession, stroppy teenagers etc).
Sounds like the same problem I have with mine. If you don''t have a manual, google for one.
Only one of those switches puts the pressure up. Last time I did it I put the pressure in the red and was so terrified of what might happen that I switched everything off. Had people round too, we all froze. Embarrassing.
Anyhow the answer was on the net. Close the valve that controls pressure. Then bleed a radiator until the pressure comes down. I think you are supposed to use a radiator key but as the proud possessor of a little socket set (product of another story of new skills) I used a screwdriver.
Thanks Pixy, but I''m not putting it in the red. THe strange thing is - it puts itself all the way up, and
- it puts itself all the way down (and then won''t come on again).
Will try googling again - I printed out what I thought was a user manual but is actually an installer manual and no use at all. When it won''t light it says F75, which I suspect is ''pressure too low''. But its that fact that it swings wildly which is so odd.
High pressure isnt a major problem, most boilers will have a safety valve that will release water through an outlet pipe on an external wall.
Low pressure can be more of a problem.
If at all possible I would try to get a heating engineer to have a look. It may be something simple like a diaphram that need replaced, but then again it could mean a new boiler. But in either case you will have some answers.
When the heating is off, there should be a red line that marks where the pressure should be - it is normally 1 - 1.5.
When the boiler is on, the water heats up, expands and sends the pressure needle higher - this is fine.
Airlocks in radiators can cause pressure fluctuations or for some of the radiators to remain cold or lukewarm. If this is the case, switch the boiler off and bleed all of the radiators. Logic tells me that you should start downstairs and do the rads upstairs last.
When bleeding radiators, you let air out which reduces the pressure so you have to keep topping up the boiler with water. You are aiming to replace any air in the system with water and get the boiler pressure back to its normal operating range.
I am getting child tax credits and for a few months have regularly been calling people about a free replacement boiler. Each time they say they will call and send someone round but they never do.
I have bled all the radiators a while back and generally keep on top of this - I check that they are hot all the way up, and (when the heating is working of course) they are.
It is all very mysterious and given I am shortly to sell the property or even be evicted I certainly don''t want to spend any money at all - my husband (previously the sole earner) has not given me or the kids anything for the best part of the year since he left.
So it is tempting just to ignore it and relight the boiler from time to time. Just I don''t suppose the lodger will be very impressed, especially when it gets colder.