Refilling key snapped in open position on Worcester MT10-safe to use?

[celluauto]

Hi all,

I wonder if someone can help. We have a Worcester MT10 combi boiler that has a fault with the expansion vessel. The landlord is having the boiler replaced this weekend, but in the meantime I was advised by their plumber to top up the pressure each morning (as it's currently dropping to 0 overnight - it swings up to 3 bar when the heating is on before gradually dropping throughout the day; this is how they've diagnosed it's the Expansion Vessel). Unfortunately, this morning I've gone to do this and now the refilling loop key has snapped off with a bit of the key left in the boiler - the key is stuck in the "open" position (ie where, if I turn the grey knob next to it, it lets in water. I have closed the grey knob, which seems to be working fine).

All I want to know is - is it safe to put the heating on with the key stuck in this position? It's very cold here, and I'd prefer not to have no central heating for 4 - 5 days.

Thanks in advance.

 

[snowhead]

As long as there is one valve shut on the fill loop it will be o.K

 

[celluauto]

Great - thank you. The letting agent just got back to us and said it should be fine too. I'm presuming the square knob (which is working fine) opens / closes one of the valves?

 

[Deleted member 120897]

I highly doubt you have an MT10 boiler, that’s the timer model number. Yes providing it opens and definitely closes, you should be fine.

 

[celluauto]

Thank you - and thank you for pointing that out, you’re quite right, it is the model of the timer! 🤦‍♂️

I’ve put the heating on and been keeping a close on it - all seems fine so far.