Vaillant ecoTec Plus & Megaflo

[M.Joshi]

We've had a new CH and hot water system fitted which consists of a Vaillant ecoTec Plus 630 boiler and Megaflo tank.

The system is installed with an external (Sunvic) thermostat and Horstmann programmer. However, the jumper across pins 3 & 4 in the boiler has been left in boiler?

Looking through the installers manual, it states that the jumper should be removed and an external room thermostat connected across them. The manual however, does not mention anything about using the boiler in conjunction with a hot water storage tank?

If a room thermostat were connected to pins 3 & 4, how would the boiler know to switch on if only hot water was required to heat the tank and not central heating?

[tom squires]

hi
if its not working then the best bet would be to get your installer back in to check the electrics are correctly fitted
or you could try speaking to vaillant to see how they say it should be fitted
thanks