Hi, My friend has a Vaillant vcw242e boiler which has been working fine all year for hot water but he hasn't used the central heating. He tried to turn on the central heating and now the hot water has stopped as well. I went to have a look and there was no water pressure whatsoever shown at the boiler. I recharged the system and bled all radiators but we still cannot get and H/W or GCH. Could he have damaged something by trying to start the heating without any water pressure? Everything seems to start ok but there is no sign of the boiler trying to ignite, the red light for failed ignition stays off. Many thanks Rob

SOURCE: reddy r200b keroseen heater will not ignite

CAD flame sensor is bad, also check your air inlet line for the fuel mix, could be cracked.

SOURCE: Radiators not getting up to temperature

depending on the piping configuration; Series loop or mono-flow, you might need bleed the system. If its a mono-flow you would have bleeders on the radiators. Bleed them only till you you have water coming from the bleeders. If its a series loop, you need to bleed them from the area of the circulator by the boiler. There is a urge system you need to use and see if you can get the information on how to do that. I would think that somene here as written a tip on how to purge a series loop hydronic system. Also check to see that you have somewhere in the 12-15 PSI on your system pressure.

SOURCE: no heating but still get hot water

Sounds like 3 port valve fault

SOURCE: I can only get heating to the radiators upstairs, not downstairs

balance the rads.
upstair radiators turn all valves off,heat will then divert downstairs,open valves upstairs 4 turns on locksheilds and number 4 on trvs if u have any.
then if that does not work get a combi or powerflush.
if u cant afford then drain a little from rads,get x300 sludge remover from plumb shop and put in header tank(not hot water tank).
then fill system up and repeat balancing.

www.jollygreenplumbingmachine.co.uk

SOURCE: Central Heating\which combi boiler?

HI right first i would look at a worcester greenstar combl
best you can get and you have full back up from worcester leave all rads with stats as they are i think you will have to remove one , the that would be the bath room also the greenstar comes with a clock bulit in these are on the worcester bosch web site i have been a gas fitter fot 30 years and this what i would go with a really good combi, you can also get awire less room thermostat for this hope this helps

Testimonial: "Thanks for your advice. I'll look into the Worcester, but I think it might be more than we can afford!! "