boiler problems

[Steven]

I/we have a gas central heating system with a "Ariston A/23 MFFI" combi boiler!

the boiler is set to summer operating mode with means hot water only.

But the heating keeps coming on!!

I've tried turning the heating temperature knob to its lowest setting and the time clock to its permanently off setting

but the heating keeps coming on!!!!!

ok I've now turned the radiators off and just hope the safety features will work and the boiler won't blow itself off the wall.

so question: is there a quick fix for this???? or should I just get a service engineer in???

thanks Steven

[SilvaFish]

I think that you ought to leave at least one radiator open for the safety mechanisms to work, else you might find a mangled boiler on the floor on one particularly cold day. Get an engineer in!

[Dave Crampton]

Have you got a thermostat? What is it set to?

This cold be the reason the bioler has come on, if the temp has gone below the switch on temp? Ditto on leaving at least one radiator on a bit.

Dave C

[principia]

knackered hot water diverter valve at a guess.

J

[angleseydiver]

Yup, diverter valve.

[Scubee]

A girlie view....ther is a thingy in the boiler or somewhere which tells the water where to go. It is about the size of a mug and is usually brass coloured and shiny.

Whack it with a hammer.

(well, it worked for me when my boiler went wrong a few years ago )






(a week later it went wrong again so i called the engineer who changed it for a new one. apparently it was broken )

[Scuttler]

Diverter valve. You can fix it yourself (I do most of my own repairs) but I'd recommend calling someone out unless you really know what you're doing.

[Air Guzzler]

How do you know its the Diverter valve ?

This particular model does not have a divertor valve but a secondary heat exchange item 89

without travelling down to Dorset and taking a good look a few questions
1. does the heating come on without the Hot water being requested eg. turning tap on.

2. Do the radiators just get a little warm ( som combi boilers use the heating side of the system as a heat dump to relieve the excess heat following prolonged use of the hot water.

Below is a link to the exploded parts list

http://www.harrian.com/Prod_info/inf...0015700001.pdf

Attempting to repair gas appliances is dangerous without the correct training and experience

[Scuttler]

Originally Posted by Air Guzzler

How do you know its the Diverter valve ?

This particular model does not have a divertor valve but a secondary heat exchange item 89

without travelling down to Dorset and taking a good look a few questions

You're the plumber but it must have some mechanism to switch from DHW to CH.....I wouldn't come down to Dorset though....the problem is in Yorkshire and I only use Vaillant boilers myself


EDIT: According to Ariston...it has a diverter valve http://www.centralheating.co.uk/inde...wFile&id=10025 Page 5 Item 9

[Steven]

Originally Posted by Air Guzzler

How do you know its the Diverter valve ?

This particular model does not have a divertor valve but a secondary heat exchange item 89

without travelling down to Dorset and taking a good look a few questions
1. does the heating come on without the Hot water being requested eg. turning tap on.

2. Do the radiators just get a little warm ( som combi boilers use the heating side of the system as a heat dump to relieve the excess heat following prolonged use of the hot water.

Below is a link to the exploded parts list

http://www.harrian.com/Prod_info/inf...0015700001.pdf

Attempting to repair gas appliances is dangerous without the correct training and experience

I'm not in Dorset am near Doncaster!!

my partner had a cold shower this morning cos it wouldn't get warm and on getting out found the radiator was red hot!!!!!
the only way she could get the boiler to stop putting heat in the radiators was to turn it off.

but I have since reproduced the boiler heating the radiators without asking for hot water!! so to 1. no

and
2. no they get really hot.

steven