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Mate put some water ionto the system first... if your gauge ain't working, get it fixed...perhaps it isn't broke and you're not topping the system back up to 1.5 bar? when u bleed u must retop the system again...try that then let us know what the boiler does

As gordon says frost stat, ...if not your valve is sticking open

Or you could convert to a sealed system

Blockage is usually where pipe B meets pipe C. Pipe A should not rise directly upwards from the vertical, rather should be from the horizontal after about 200mm (not usually practicable). As Gasman for 45yrs says, cut it all out. Use an airject.

If it lights for about 6 - 7 secs and cuts out the problem is rectification. Been to one the other day, cleaned the rectification post and it fired fine, never recalled to me. It was doing what your boiler was, sometimes ok, other times not. I would feel a lot better cleaning the post with some...

blocked cold feed mate, the pipe from boiler must turn horizontal before the vent (22mm) rises followed by the cold feed (15mm) - use an airject would do the trick. If all those factors are observed then the cold feed is usually blocked

If you follow the flowchart to the letter, it will take you to the fault mate

you shouldnt get 0 ohms, you should have a readable resistance which will be the same as when the 2 leads are together (test). there will be OL not 0 ohms mate - that means it is screwed. link it out for test purposes

Never seen it and it is totally illegal...as you probably well know...how can the prv run into the air intake of a flue and be right!!? This must be a wind up mate

Whaaaa.....!!?

I just can't believe all this

ok mate

WTF....Antifreeze?? Is this a windup mate. If u have indeed put antifreeze in the system.. I'm out of here b4 I make an extremely rude comment. That will almost certainly void your warranty.

I think u'd better start by returning those valves under warranty mate or ur gonna go broke. I've never heard of DV's packing up so quickly on these

sludge will cause this, but more likely it'll be ur pump mate

We have found that plastic pipes only accentuate the Electrolysis process and thus have been to properties only 8 months old with pure black system water. To add salt to the wound, it can't be reliably powerflushed

The only thing it can be is the plate to plate, nowt else, otherwise we aren't getting the full info from you here. If the boiler is running then it will naturally rise in pressure. Are you saying that the pressure rises whilst the boiler is off?

Actually I've had plenty of plate to plates passing ..it's more prevelent than you think

Why would you want to fit an Alpha?