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need more details please Is it a turbomax with black plastic front or grey? If it's black how far does the light sequence get or if it's grey does it have a fault code on display?

Is the boiler noisy when it fires up from cold? Also do you have any idea what the boiler is range rated to. Originally they were factory set to 18kw but can be adjusted up to 30kw. So if your trying to put 30kw of heat into a smaller heating system it can cause this problem. Other causes...

Only problem you might come across using an inverter is that the boiler electronics might not like it. Most modern boilers need a good earth connection and some do not like running on generators

The yellow light only comes on when the burner is firing. If the pre heat function is on ( green light on ) turn it off by turning the hot water dial fully off so green light goes off then turn dial back up. Turn on hot tap Does the green light flash when a hot tap is turned on? If the...

I'd alter D.0 on the boiler to 15 and adjust heat curve to 2.5 then see how it goes

First 2 things to check for. 1- has the boiler been range rated on the heating to match the demand of the house? this boiler comes factory set at 28kw that will easily heat a large 5 bed house. 2- did you alter the heat curve on the vrc430? for a normal rad system it should be set to...

Is it the 837 combi you have fitted? If it is why have you got a vr65? This is a wiring centre for a y or s plan system

Maybe you should question the bg engineers competance to repair the boiler than blame the boiler itself??????? Anyway back to your original question..... It depends on the state of the water in your system and whether it is going to get flushed out properly. Aluminium heat exchangers...

Pcb's Top - Igntion pcb Middle - cpu board Bottom - Fan pcb the one they all plug into is the motherboard with the on-off switch Be careful also as this boiler has different cpu board and motherboard depending on age. This is classed as hybrid and non hybrid pcb's

Are both microswitches being operated on the diverter? If they are then possibly its a motherboard fault. With dhw ok it rules out the fan and ignition pcb. Try giving the ch switch next to the on off switch a prod to see if it makes it work

Nice complex boilers to work on these lol. One thing to check for is that the diverter is moving into the central heating mode properly. The purpose of the servo valve is to move the diverter into the correct position. If someone has increase the length of the pin above the watersection that...

Does the hot water light stay on constantly? If so you are looking at a problem with the dhw flow switch stuck in the on position. This can be due to either a faulty microswitch that has been damaged due to water leak from spindle on the brass membrane cover or the pin isn't retracting fully...

What a laugh reading all the threads. Vaillant 400 range is a cracking boiler when fitted correctly, and doesn't matter if vaillant controls are fitted or not. Problems this range of boilers suffer from is undersized pipework on flow and return ( yes they are 22mm tails on boiler but for...

First I would definitely drop the value on d.0 to about 16 which should help. Also if the boiler is reaching temperature so quick there might also be a circulation problem in your heating system. Do you have trv's fitted and turned down restricting flow? Is the hot water ok?

Possibly the shift load pump has failed. Get someone in that knows this boiler as it's a b'stard to change

How long does it take for the boiler to reach temperature on the central heating? If it is quick your boiler will cycle and cause more gas usage. I'm betting the heating hasn't been range rated and is still set on the 24kw ( I think) factory setting which by the sounds of it is a little too...

the vaillant will give you very few problems as long as they are put onto a clean system the stainless heat exchanger is very unforgiving with dirty system water. Also consider the glowworm ultracom hxi only difference between glowworm and vaillant is the circuit boards both pcb's very reliable...

Now Now boys anyone would think your trying to make out BG only want people that can sell things to their loyal clients and that fixing heating is not as important. WELL YOU WOULD BE SPOT ON THERE They sould be done for false advertising saying an engineer will call and should be...

Now Now boys anyone would think your trying to make out BG only want people that can sell things to their loyal clients and that fixing heating is not as important. WELL YOU WOULD BE SPOT ON THERE They sould be done for false advertising saying an engineer will call and should be...

Thankfully you have got a good result but if we are all honest this is basically a **** BG engineer that is lazy and can't be arsed doing a bit of a tricky job. So came out with a load of BS. I bet you he offered to get a sales rep round to quote for a new boiler