All summer without using the heating we have no problems with just hot water. As soon as we start using the heating for short periods and then revert back to the hot water setting the water temperture is luke warm. We can get the water to what it should be by turning it on and off quite a few times until it then works.

roger crook, October 2009

Hi i have a saunier duval thema condensing f30e boiler the problem I've got is the hot water goes hot and cold, any answers please

paul brazier, August 2015

That is a diverter valve problem. Any decent engineer would know that

Ant fgcc ltd, August 2013

problem is the diverter valve

jason, November 2010

it is your three way valve that is passing, need a gase safe engineer to fix your problem, not a plumber

paul, April 2010

saunier duval semia conden f30e g.c.47-920-52 fan and pump working but thats it no hot water or heat can you help me

nigel, November 2009

we have had the same problem since we had it installed nearly 3 years ago. the hot water ran cold when running a bath. now out water is luke warm in the morning when we have had the heating on the night before. we have had the heating engineer out on numerous occasions in the last 3 years and they cant see why it is doing this it is not all the time but it is very frustrating. they have changed nearly every part in the boiler but we still get the same thing happening .

jane, October 2009

WE ARE HAVING THE SAME PROBLEM ONLY OUR RADIATORS COME ON WHEN WE RUN THE HOT TAP. PLUMBER STUMPED AND LOOKING INTO IT FOR US

CAROLE, October 2009