Dear all My boiler has no power after I tried to connect external timer box. I have checked all the fuses and they are ok. I tried to install Horstmann C27 timer. I have connected NL1234 wiring on the Horstmann timer to NL2345 on the vaillant boiler then I realised there was no power on the boiler. No lights at all. I took off the timer completely then put all the wiring back how it was before still no power on boiler. Wall socket has power but nothing in the boiler. What do you think is the problem? Regards
There are two fuses on the circuit board & there is a reset button I think on some early models, haven' to got a manual to hand to check. http://www.vaillant.co.uk/downloads/turbommax-installation-and-servicing-261455.pdf
Vaillants have terminals 345 for external controls. You are not meant to use the LN. 3 is live, 5 is neutral, 4 is the live "demand/fire/call" return. If you connected it as you said above, you would of shorted the L to N and blown the control fuse. A C17 timer would be more appropriate as its single channel. You're not controlling the hot water.
Thanks Lec, you done what I couldn't do, poorly pc,sometimes your can't copy & paste,needs Windows 7 reinstalled. And I corrected my inital error to the correct NL345.
I think I connected wrongly.I have used NL. But 3 fuses on circuit board and I check them all. They are all ok. Is there another fuse that I can't see?what shall I do now?
Not that I'm aware of. As JP has said, you might have fried the pcb, might even be something very simple gone wrong,your going to have to get engineer compentent with Valliant to sort the boiler, if it's the pcb then it's expensive, plus his time, going to get expensive for a old boiler. Out of intrest why did you try to fit Horstman timer? Have yout got a single channel timer you could try to rule out the Horstman C27 being faulty.
I m kind of new on this form. I post picture of circuit board. I notice a little brown mark. I m not sure what it is
No idea with testing,I'm not there, but I still don't understand why you used a 2 channel timer, when a 1 channel is all that was needed. One other thing is room stat is on, & not turned right down,so not calling for heat.
There is no power at all on boiler. I disconnected the timer and connected the cables as it was before. No power on boiler.
What is the quickest solution. Do you think I can replace those. And any idea where can I buy those 2 resistants? Is there a name for them?