Saunier Duval Thelia 623 have hot water but no heating !

[Jamster69]

For the last 4 weeks i have had the boiler on Summer mode ie just used for hot water which is ok , but when i recentley switched it to winter mode ie slid the slider to hot water and central heating. I don't get any heating, the pressure on the boiler is at 2 bar , the boiler fires up ok when i turn on the hot water taps but when i turn it on for heating nothing happens , i am doing this manually and made sure it is not on the timer etc , pilot light is ok, has anyone any ideas how to get the central heating working cheers

 

[spacethegas]

room stat ?

 

[Jamster69]

Hi Space the Gas , thanks for replying. excuse my ignorance but room stat ? is this a thermostat ? Our central heating dosn't have one a room thermostat to control the heating., heating is controlled on the boiler or on the radiotors themselves, cheers.

 

[spacethegas]

sorry i'm unfamiliar with this boiler.

 

[sambotc]

Sounds like the timeswitch if nothing at all is happening. Do you have the thermostat for heating on full and the timerset to contsant?

 

[Jamster69]

hi sambotc thanks for replying , The heating is on full , the timer i reset and is on manual i'm sure cheers.

 

[Jamster69]

Hi i tested the timer on the boiler , i reset the time, set it to come on and off within 4 minutes , 4 times differrnt times , it seems that it wants to fire up and i can here the fan going but nothing else , cheerr

 

[Agile]

It will not fire up on CH if the CH sensor is open circuit.

Located at top left and its quite a low value by boiler standards.

If thats Ok then there is a CH setting pot on the PCB which might have failed but may just be a dirty wiper contact.

I dont work on Sonya Duvals except for very good friends indeed.

Tony

 

[sambotc]

Hi,

OK so that is a differant fault!

You will need to try and identify what exactly is trying to work.

So at present we know the timer is OK and sending the signal to fire. Next you need to identify if it is the pump running or fan firing or both.

http://www.saunier-duval.co.uk/manuals/pdf/noncurrent_products/installation_Thelia23-23e-SB23e.pdf

Above is a link to the manufacturers instructions if you haven't got them, may be useful.

Sam

 

[Deleted member 105431]

Buy a new boiler-it's a bag of ****e not worth fixing! Lol.

 

[spacethegas]

Buy a new boiler-it's a bag of s***te not worth fixing! Lol.

dont beat around the bush.

tell him what you really think.

Untitled

• spacethegas
• 26 Jul 2008
• 2

 

[Jamster69]

hello guys thanks for your input, right this is how far ive got ! CENTRAL HEATING IS WORKING but when i move the choice of selection lever all the way over to winter mode ( central heating and hot water) the boiler stops firing but when i put it only to half way it fires up again. and radiators heat up . I have a question i have a valve conecting two pipes like a cross over should this be closed , open and half closed ?

 

[sambotc]

Hi,

This is the by pass i belive, it should be set as required.

Sounds like the timeswitch itself is playing up then. From what i remember i think the price for a replacement is ridiculous for something nothing more than a casio watch!

If that is the case you may want to consider replacing it with an external clock or even better upgrade to a programmable room stat which will bring you up to date with current building reg's.

Sam

 

[hedsa]

To prove the timer is at fault there are four blue wires going to clock link the two with the smaller spades together.if the boiler then works with the lever pushed to the right then the clock is faulty.

 

[Jamster69]

Cheers for replying again guys , i left the lever in winter postion (over to the right) and set up the timer to come on at 0730 this monrning , but it didn't come on automatically i sounding as if it want to fire up but didn't , so i put the timer back on to manual and and put the lever in the middle between summer and winter and it still wouldn't fire up where as it would fire up ok doing this last night ! , so i put it to summer ( hot water only ) and ran a tap and it fired up ok , then put it between winter and summer and it remains firedup , but the second i put the lever over to winter setting ( over to the right it stops) .


Has anyone of you experts got any other ideas , i fully appreciate your input and time guys cheers