Mend > Home Heating Systems

Mend Saunier Duval SD40 Boiler Water Heater

the pilot light keeps going out when im trying to light?

sut is collecting round the boiler cant get it to work just got a new tank were the water runs through it last year worked fine for a few weeks on my saunier duval model sd40 caravan water heater

gail kelly
September 2007

Saunier Duval Saunier Duval SD40 Heating, Home Heating Systems Boiler Water Heater Saunier Duval

>its just a small copper tube around 4mm thick . thats what ignites the pilot

is it ? - no - thats not how a thermocouple work.

the spark electrode ignites the pilot light
the idea of a thermocouple is to keep the gas valve open.

heat from the pilot light onto the thermocouple generates an electrical current which operates the solinoid valve to stay open.

should the pilot light go out the thermocouple wil cool and shut the gas valve.

never mind another diyer giving false and dangerous advice.

stick to shelf stacking. you can't get that wrong.

hi-spec plumbing
September 2007

go to b@q wicks. or any diy store. and buy a universal thermal coupler. around £4.00 . unscrew from your heater and replace new one using one of the connectors supplied with the new coupler..you are not touching the gas supply so dont worry. although it is advisable to turn off before you start..its just a small copper tube around 4mm thick . thats what ignites the pilot.. you should have no problems

rob clayton
September 2007