Glow-worm Ultracom 30CXi water temp fluctuating

[mpg]

Hiya folks.

I've just replaced the cartridge in my Mira 415 shower as the temp was beginning to fluctuate... And its still doing it.

I've checked the boiler and the pressure was a little low so upped to 1.2bar.
Was @ .8.

What I noticed was that the flame icons whilst the shower was running at hottest. Were going 2-3-4-5-2-3-4-5-2-3-4-5. At about the same frequency as it feels like the shower is running hot and cooler. NOT cold.

Any Ideas
Cheers
Matt

 

[Agile]

The plate heat exchanger in the boiler may be blocked.

But first turn down the water temp control on the boiler towards minimum.

Turn shower to nearly maximum heat setting. Then see how it is.

Next clean out shower holes with a pin or with acid.

Then see how it is.

As a last resort turn a hot tap half on and see what difference that makes to the shower.

Tony

 

[mpg]

Thanks Tony,

The showerhead was cleaned today. its fairly hard water round here. So limescale is a problem.

I'll try turning down the water temp in the morning. Its set to 70c now.

Will report back

 

[Agile]

The boiler should not even go up to 70 C. Set it to about 48 C

Tony

 

[DP]

Have looked at the manual for your boiler. Would suggest 70 degree C is the correct temperature indication.

Can you run, say the bath tap and post your findings?

 

[Agile]

Why 70 C for hot water?

 

[mickyg]

whats the temperature like at other taps??

 

[DP]

Look at the manual Tony. I never said 70 at the tap

 

[Agile]

The user guide says the DHW is supplied set to 40 C but can be increased to a maximum of 62 C.

Where does 70 C come into it?

 

[DP]

The burner size is indicated by digits 1 to 5 and primary is neumerical display. OP did say it reads 70 degrees.

 

[mpg]

Sorry guys OP may have been wrong.

Although It had the tap symbol and actually read 68deg. I have now turned down to 50 deg and it gave a eco symbol next to it.

Been away so have not had time to check it but will check again today.

Flame symbols seem to be a little more stable though.

 

[mpg]

Ok I have turned the HW down to the Min which is 40 Deg and its still fluctuating. Shower and kitchen sink. Both within approx 3 foot of boiler.

Any Ideas

 

[Beerlover]

The plate heat exchanger in the boiler may be blocked.


Tony

You had the correct advice, right at the start.

 

[mpg]

Ok so where do I strike it with a hammer and how big a hammer do I need.

 

[Beerlover]

You sound like a boiler engineer already.

Search the forums for' how to clean a plate heatexchanger' and I'll try and find a bit more info in the meantime.