How to mend ... Duval 623 Help

pilot light?

i have a saunier duval sd 623 combi and i am having promlems getting the pilot light to stay lit. it was worki... [Read more]

SAUNIER DUVALL THELIA 623?

My Saunier duval boiler 623 is constantly fired up? Would this be the thermostat? Help as this is costing ... [Read more]

Thelia 623 high pressure?

I have a Saunier Duval Thelia 623 and although it fires up when i turn on the hot tap, it is refusing to come ... [Read more]

Saunier duval 623 combi not igniting?

No hot water or heating. When I press the ignition button it fires into action but goes off as soon as i take ... [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

looking for a part?

where can i find spare parts for a saunier duval 623 in london before i freeze to death.

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]

NO HOT WATERFILLING LOOP ON SAUNIER DUVAL SD 623?

SAUNIER DUVAL SD 623 COMBI BOILER PRESSURE AT ZERO BAR HEATING OK BUT NO HOT WATER. FILLING LOOP PESSURE LOOP... [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]

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

When heat in thermostate put two on , heating comes on for a while?

When heat in thermostate put two on , heating comes on for a while and when heatings on no hot water but pilot... [Read more]

leaking boiler saunier duval sd 623 14 years old?

i have a saunier duval boiler that is leaking inside it is leaking from some sort of housing at the bottom of ... [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]

how do i turn on the timer on a saunier duval 623?

I recently moved into a house with an sd 623 but the timer appears not to work. Is there a switch to turn it o... [Read more]

I have a saunier duval sd623 combi, I have no hot water or heating?

I have a saunier duval sd 623 combi, I have no hot water or heating. When I turn a tap on the second(main) he... [Read more]

Fixing a Saunier Duval SD 623?

I live in France but have not had any success finding an answer here. Irregularly the boiler fails to restar... [Read more]

hotwater low temp?

saunier duval thelia 623 water will not heat.