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My daughter's flat has a combination water cylinder with an immersion heater. The heater does not work and needs replacing but so far I have been unable to unscrew the old unit. The spanner I'm using carries a warning about not using undue pressure as the cylinder may distort or even break...

Wilhelm/Oilman Thanks for the advice. The boiler is leaking from underneath but I can't see from where so possibly it's the water jacket? I have experience of amateur plumbing but nothing with boilers but am willing to give it a go if it's fairly straightforward. Do I just dive in and...

I have a small cottage with 8 rads (9 if a double is counted as two) with a Grant 90 combi boiler that has given up the ghost and has to be replaced according to a well known and respected local heating engineer. When the boiler worked we only got a very slow flow from the domestic hot water...

Thanks all - will heed the advice

Oilman Thanks for the advice will call a heating engineer

I have a Grant Combi 90 boiler and the pressure gauge keeps falling to zero when the boiler is not providing hot water - when it is heating then the pressure rises to normal. I used to open the valves and top it up but the pressure falls again very quickly so I gave up and it doesn't seem to...

I believe my daughter's immersion heater has failed and may need replacing. Can I just disconnect the electricity, turn off the cold water supply and remove the old unit or do I need to do anything else? Thanks

Thanks to all contributors and no offence was taken re. comments about my terminology. Hope to have no more questions that will expose my ignorance! Regards Snowsride

Mandate - thanks Will try disconnecting the loop this coming weekend so no more questions until next week! Regards Snowsride

I've been found out - I am not sure they are wired in series - I just used the term I have heard to describe how I have seen the cable connected! I belive Securespark's 'sequence' description is correct i.e. Mains to Switch, Switch to Light1, Light 1 to Light 2, Light 2 to Light 3...

Hi The red 'target' needle on the gauge is set to 1.1 bar and I re-pressurise to this level. The pressure rises to over 2 bar when the boiler is burning and then it falls to zero when it is off. The original pressure relief valve had a 'relief' pressure of over 3 bar but the replacement...

I have recently bought a house that has three outside lights professionally wired with armoured cable buried in the ground. The lights are wired in series i.e. from the mains switch the cable runs to Light 1, then from Light 1 to Light 2 and from Light 2 to Light 3. I would like to add one...

This question is associated with my earlier one about a Grant Combi 90 that keeps losing pressure but I have posted it as a new subject as I hope it may provoke responses from others... In an attempt to cure persistent loss of pressure in a Grant Combi 90 I replaced the pressure relief valve...

I have a Grant 90 boiler that should be at 1 bar pressure when cold but it keeps losing pressure to zero bar. I have replaced the pressure vessel and the pressure relief valve but it still keeps losing pressure however this doesn't cause it to malfunction or cut out except that the domestic...

Descaling begins to sound like a bridge too far. Will consider repacing the heat exchanger. Thanks to all contributors Snowsride

Boilerbeasty Thanks - will consider all options. Snowsride

Do I have to remove the heat exchanger on a combi boiler to descale it and if so how? If I don't have to remove it how do I get the descale liquid into the system? Thanks Mike Collard

Thanks to everyone who has replied - will follow up al suggestions. Regards Mike C

I have recently bought a property with a Grant 90 combi boiler which heated the rads OK but not the hot water. The previous owner of the house paid for a plumber to make some repairs which included replacing the diaphragm in the boiler and a couple of other things, including fitting a new...