I have a Vaillant ThermoCompact boiler which has started to play up. It seems "reluctant" to produce hot water sometimes. This first happened last winter, but only very intermittently, and only for the shower which is upstairs. Now it's more common to either get the shower not running hot, or to have it go cold half way through. Usually a few seconds turned off will get it going again, but sometimes it takes a couple of goes.
I was wondering if it's a low pressure thing - the shower head is the highet outlet in the house and I never get the problem on any of the other taps. Anyway, the boiler is in good condition, so I'm hoping it will be servicable? Does it sound like I'm right, and is it a DIY job?
Cheers,
John