boiler not starting

[mtm]

Hi I have a Worcester greenstar camray boiler. Has been working fine but noticed air circulating around the system. I knew I needed to bleed radiators and probably top the system up with water. Today the system failed to start and sure enough no pressure on the gauge so assume cut out because of this. I topped up pressure to just over 1 bar and vented the radiators. The boiler wont start. There is no reset button on the boiler and the burner has not locked out so I am now lost as to what could be the problem. Ideas welcome please.

 

[gigz]

Try topping it up a bit more. Not sure on your model but some incorperate a pressure switch that sometimes gets a bit of crud in them.

 

[mtm]

topped up to 2 bar no joy

 

[gigz]

There is a reset button on the underside of the front panel

 

[mtm]

I cant find the reset, but switched the time cock to hot water and the boiler fired. So I replaced the room thermostat and still no central heating. Now really confused.

 

[Terrywookfit]

Is the circulating pump running.

 

[gigz]

Wont need resetting if the hw works. Probably is stat or timeclock related. Contact on heating selecter could be faulty, try switching between heating/hw a few times.

 

[gigz]

Ignore the image, it wont delete ???

 

[mtm]

yes pump is running so agree it may be time clock related. Strange though as all was fine until the low pressure issue today. Guessing I need to replace the time clock next

 

[gigz]

Expensive guessing game mind.

 

[Madrab]

buy a circuit tester, probably end up cheaper

 

[dilalio]

Energise heating on terminal on time clock with a loop is even cheaper