Combi boiler hot water help

[w2w]

hello I'm new to the forum and I have a problem that hopefully someone can point me in the right direction. If it's in the wrong forum I appologise for my ignorance.
We live in a rented house and our landlords [an estate agent] always seem to use the cheapest tradesmen to do any job concerning the house. We've had their plumber/central heating engineer out and he's just fobbed my wife off with an excuse.."these sort of things happen.."
The problem.
Downstairs the hot water is fine, but upstairs on about 1 day in 3 the hot water from the taps in the pedestal basin and bath run from luke warm, to freezing cold to scalding hot. This makes having a shower impossible [shower connected to the bath mixer taps] Now the plumber/engineer told my wife "these sort of things happen with these shoer fittings and these boilers" when my wife pointed out that it had been fine every day for the last 6 years he said "luck". But it's not just the shower IT'S ALL the hot water upstairs.

I'm hoping someone can recognise this problem to give me something to go back to the landlors with.

I do not know the make of the boiler as it has no model or make on it, but I've taken a picture if that's any good

The hot water is set on constant at 70 degrees and the heating only comes on when turned on [no timed programable thermostat]

PLEASE HELP IF YOU CAN SOMEONE?

 

[gas4you]

From the age the boiler looks I would suspect the DHW heat exchanger is scaled up.

Don't be fobbed off with excuses. Insist on someone local who can fault find and knows what they are doing

 

[baxpoti]

Demand a reduction in your rent, until hot water is satisfactory.

 

[kevplumb]

that pressure gauge looks well up

 

[baxpoti]

that pressure gauge looks well up

Probably broken as well

 

[PlanetThanet]

Hi

Any idea of make?

C.G.

 

[Agile]

I thought it looked low at about 0.7 bar! If so increase it to 1.5 bar.

Agents do like to send the cheapest and usually not very clever people to deal with boilers and its usually the same person they send to deal with a blocked toilet too. Not much specialism there!

You should tell the Agent that you are not happy with the boiler performance and you want it fixed within a reasonable time. Perhaps an assessment by a competent person within three days and a fix within 10 days as it is giving CH all right and only the DHW is a partial problem.

Tony

 

[w2w]

Cheers I'd just like to point out that it's just the hot water upstairs that is affected by this and then [so it seems] only first thing in the morning. I've tried it with the central heating turned off and with it on, esn't seem to affect it either way.
I cannot tell the make of the boiler, that's why I put the pic up hoping that someone would recognise it.

Oh and he changed the sensors [whatever that means] last time he came, and YES he does unblock the drains and see to the central heating as well

oh and I've got it set to 1.5-2 bar