How to mend ... Saunier Thelia Duval

How can I fix the leak in Saunier Duval Thelia 23 boiler?

I have no pressure on the gauge and have a water leak, there is no hot water or heating and am desperate to ha... [Read more]

Saunier Duval Thelia 623 - No spark or full ignition! HELP!?

Hi guys, I have a Saunier Duval Thelia 623 boiler. It stopped working recently and on opening i noticed the ... [Read more]

saunier duval thelia 623 combi?

the boiler gas flame run on low flame on heating neaver goes on full flame

saunier duval thelia 23 when i use the boiler a screaming noise?

using the boiler there is a loud screaming noise the fan is on all the time and have to turn it off from the m... [Read more]

Saunier Duval Thelia 23- no heating/hot water?

The problem seems to be the clock/programmer. With the slector switch set to 'auto' the display will normally... [Read more]

i have saunier duval thelia 623 which won't fire the heating any ideas?

The system had to be recently drained to fit a new radiator. It was then refilled (to correct pressure) and wo... [Read more]

Saunier Duval Thelia 623 has hot water but no heating help?

For the last 4 weeks i have had the boiler on Summer mode ie just used fof hot water which is ok , but when i ... [Read more]

Saunier Duval Thelia SB 23 - pilot won't light or stay lit?

The pilot will light with a match but there is no 'spark' and if lit with a match , the flame dies when the 'O... [Read more]

Saunier Duval Thelia 623 boiler / shower issue?

Saunier Duval Thelia 623 combi boiler The weathers nice at the mo so the cental heating has been off the l... [Read more]

How can I fix the boiler?

My boiler fires up as normal, however I have intermittent hot water while using the shower or bath. The hot wa... [Read more]

saunier duval Thelia 23e 12 yrs old?

Hot water runs for approx 15 sec's before running cold for about 5 sec's and then repeats hot and cold. When ... [Read more]

Saunier Duval Thelia 623 boiler?

I have just noticed that there is very low pressure in my hot water taps. I have checked the boiler and the pr... [Read more]

how can i fix my saunier duval thelia 623 combi?

I only get hot water when the heating is on

saunier duval thelia 23?

new house - dead boiler. I have replaced the diverter valve & piece which it mounts to, now the micro switches... [Read more]

Increasing water pressure?

How do I increase the water pressure in a Saunier Duval Thelia 23? I believe this is done by locating the fili... [Read more]

boiler flame pulsate?

our boiler saunier duval, model No Thelia 23, when swathed on the flame pulsate, corgi reg engineer came to lo... [Read more]

thelia 23 boiler. No hot water upstairs when heating is on?

I have a Saunier Duval combi boiler, Thelia 23. Hot water works fine upstairs and down when the heating isn't... [Read more]

How do i fix Saunier Duval boiler - Model Thelia 623?

I have water seapage from the pump around the top of the serrated brass cap at the top of the pump (to the fro... [Read more]

unable to fill my combi?

i removed a radiator then when i came top the water back up i cant seem to get it to fill i opened the air ven... [Read more]

hotwater low temp?

saunier duval thelia 623 water will not heat.