Megaflo , pressure relief valve and shower dripping

[Bettyboo]

Morning All
I have a Megaflo unvented cylinder . Water had been dripping into the tundish so I tried to recharge the air gap, but when I went to turn the pressure relief valve it would not turn at all, as it usually would. My shower has been dripping in the bathroom next door , could in anyway this affect the Megaflo and the pressure relief valve or vice versa , the shower , causing it to drip?
Thanks for any advice
Betty

 

[Chuck]

If the 'TPR' valve you usually turn to recharge the cylinder has seized it needs to be checked/replaced by a plumber who is qualified to work on unvented hot water systems. This is a safety-critical component and therefore not a candidate for DIY.

The dripping shower would not have caused the TPR valve to seize in the way you describe. It's possible that, if the shower takes its cold feed from the unregulated mains and the mixer is passing and the shower was not fitted with non return valves in its feeds, it could cause the TPR valve to drip. This is not a likely scenario but is something you can ask your plumber to check when they come.