HRM Wallstar

[plm]

Having problems after servicing, HRM Wallstar oil boiler (not a combi). Air getting into clear oil line. Have pressure tested fuel line, OK, and replaced fire valve. Small air bubbles can be seen coming from FV and also in opp direction from pump. Give us a clue please

Thanks in advance

PLM

 

[Robtheplumb]

How long is the pull to the oil tank? also(stupid question time) how full is the oil tank? Is there a tiger loop fitted?

If the pull is long it can allow air that is traped in the oil to be released.

 

[plm]

Robtheplumb,
Sorry for late reply but only went back to job tonight as boiler failed again.

Fuel run is approx 5 metres horizontal from tank then about 1.5 metres vertical rise to Fire Valve/ Non Return Valve. Tank is bottom fed and about 3/4 full. There is no Tiger Loop fitted. Boiler apparently running ok until I removed burner to clean baffles etc. Small bubbles coming from fuel pump side and fire valve side, boiler also locking out at times even with minimal air in hose? No joy from HRM as to possibilites.

Thanks

PLM

 

[IggyFox]

Did you ever solve this, I'm having the same problem?

 

[plm]

Iggyfox see reply to pm

 

[mic1000]

Hi,

Sorry for jumping in straight after joining, but as unfortunately seems to be the way, I only find these useful forums when searching for solutions to a problem!

Anyway, I think I have a similar problem. My Wallstar keeps locking out and when restarted I can hear the air in the oil pump on the burner, but I don't know if it's a leak as such or just cavitating. It's fine until the weather gets very cold, then it usually stays running once it's started (so might lock out first attempt in the morning, but will then be OK all day), but now is locking out any time. So I'm assuming as the oil gets thicker it reaches a point where the pump can't pull through oil and either pulls in air from a leak or cavitates.

I'm wondering if the pump has just had it, but any ideas greatfully received! Just to add that I had the same behaviour last year when I found water in the tank filter which had frozen and blocked the line of course, but I got rid of that and now there's no sign of water/ice in the filter housing when it's cutting out.

Thanks,

Mark.

 

[IggyFox]

fitted new pump and problem seems to be fixed, no lock outs in last 2 months, air was coming back into fuel line from the pump when boiler was on standby & then when it tried to fire up the build up of air in the line caused lock out.

 

[mic1000]

Thanks IggyFox!

I did suspect the pump and had even ordered one, but didn't want to fit it until I was more certain that was the cause. Reassured by your reply I've just fitted it and so far so good! The old one was quite oily around the drive shaft seal so I'm guessing the seal had worn and is where air could be have been leaking in.

Anyway, thanks again!

Mark.