DIY Doctor UK DIY Forums

Hi all

I have a Vaillant Turbomax VUW 242/1Ecombi

The Hot water only comes on when the taps are open on full blast. When I open it slightly the boiler does not light up.

Only when I open the taps fully does the boiler light up.

Central heating is working fine.

whats wrong

thanks all

Movement of the domestic hot water through the Valliant boiler is monitored by a aqua sensor(flow generator) or a flow switch which signals the gas valve, at a predetermined minimum flow rate, to open. This would be the first thing to be checked. However, qualified gsr engineer required for any repair