FabSwingers.com forum: Hot water combi boiler question

By (user no longer on site) OP
48 weeks ago

My combi boiler seems to be playing up

When I demand hot water I hear the boiler fire up then a short while later with the tap still running the burner stops if I leave the tap running it kicks in again then stops and so on.

I've checked water pressure its about 1 1/4 bar, no error codes.

Anything I might be able to do before I ring the boiler man ?

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By *eroLondonMan
48 weeks ago

Mayfair

What temperature have you set the HW to on the boiler? If it's set too low it's probably reaching it's temperature sooner and then flaming out before it kicks in again.

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By *om and JennieCouple
48 weeks ago

Chams or Socials

Ours does the same. But ours is 17 years old & on its way out. Gasman keeps it ticking over safely for us though until we get round to replacing it (ie win the lottery)

J x

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By (user no longer on site)
48 weeks ago

Does it just do it on hot water or heating as well?

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By (user no longer on site)
48 weeks ago

Might be a diaphragm... Calling a plumber will be the fastest, surest way!

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By *ewby01327Man
48 weeks ago

Daventry

When was it last serviced?

Heat exchanger could be blocked

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By *ools and the brainCouple
48 weeks ago

couple, us we him her.

Diverter valve.

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By (user no longer on site) OP
48 weeks ago

"What temperature have you set the HW to on the boiler? If it's set too low it's probably reaching it's temperature sooner and then flaming out before it kicks in again."

I'll try and answer the other Q's on here as well.

Set the hot water at 60 ish.. never seems to get therr..

If I run the central heating that runs fine only seems to be the water

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By (user no longer on site) OP
48 weeks ago

"When was it last serviced?

Heat exchanger could be blocked "

Serviced about july this year, Its on a service contract so gets one every year, only thing the guy found was a leak on the expansion vessel which he reinflated

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By (user no longer on site) OP
48 weeks ago

"When was it last serviced?

Heat exchanger could be blocked "

When it was installed they fitted a magnatite filter (fernox tf1)

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By *eroLondonMan
48 weeks ago

Mayfair

"What temperature have you set the HW to on the boiler? If it's set too low it's probably reaching it's temperature sooner and then flaming out before it kicks in again.

I'll try and answer the other Q's on here as well.

Set the hot water at 60 ish.. never seems to get therr..

If I run the central heating that runs fine only seems to be the water "

•

It could be your flow switch.

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By *itygamesMan
48 weeks ago

ive just had a new combi fitted , gloworm , 2400 , fixed price thats because i had a regular system , ie tank in loft emersion heater etc , was only 1800 if a like for like swop.

is your thermostat working ok

could the rads need bleeding

is it possible to turn off at the mains , electric i mean , leave for 10 mins then fire it up again

is there a pump , give it a tap with a hammer

turn the temperature right down , leave for 10 mins then turn it up again..

waffle i know , ive just drank a bottle of wine lol

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By *rodigalMan
48 weeks ago

sunderland

Clean the flue check it's not blocked

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By (user no longer on site) OP
48 weeks ago

"What temperature have you set the HW to on the boiler? If it's set too low it's probably reaching it's temperature sooner and then flaming out before it kicks in again.

I'll try and answer the other Q's on here as well.

Set the hot water at 60 ish.. never seems to get therr..

If I run the central heating that runs fine only seems to be the water

•

It could be your flow switch."

I'll ring the serv8ce co. Tomorrow, was hoping for a quick fix or my shower in the morning wi be very brisk.

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By *itygamesMan
48 weeks ago

even if its a simple fix there gonna turn it into a big issue

hopefully ya boilers still under warranty , my recent glowworm comes with 10 yrs

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By *ellhungvweMan
48 weeks ago

Cheltenham

It could be your turbo encabulator.

I hear the old ones are made of prefabulated aluminite, surmounted by a malleable logarithmic casing in such a way that the two main spurving bearings are in a direct line with the pentametric fan.

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By *ustamanMan
48 weeks ago

weymouth

As this is my industry I feel qualified to offer an opinion. It sounds like it's cycling, ie the primary heat exchanger gets to hot shuts the burner down cools and fires again - this happens if it can't get rid of it's heat quickly enough. Causes for this are either a blocked (scaled up) dhw heat exchanger or a blocked internal filter. The fact that you have your hot water set to 60'c my monies on a scaled dhw heat exchanger.

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By *ools and the brainCouple
48 weeks ago

couple, us we him her.

It could be your flux capacitor or your dilithium crystals are dried up

It's your diverter valve.

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By (user no longer on site) OP
48 weeks ago

Cheers for the advice folks.. not something I'm gonna be sorting ... i'll ring the service company in the morning hopefully get someone out next day or two.. cold water showers has effects on guys that ain't confidence inspiring

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By *orny-DJMan
48 weeks ago

Leigh-on-Sea

My previous boiler started doing that, so I had the boiler serviced, which seemed to make it worse. The chap who serviced it reckoned it was about 20 years old.

Got a new one now

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By *ig1gaz1Man
48 weeks ago

bradford

"My combi boiler seems to be playing up

When I demand hot water I hear the boiler fire up then a short while later with the tap still running the burner stops if I leave the tap running it kicks in again then stops and so on.

I've checked water pressure its about 1 1/4 bar, no error codes.

Anything I might be able to do before I ring the boiler man ?"

its diverter valve depending on your boilers make.

If faulty it tends to heat a rad closest when it fires up a quick check will point this out.

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