basics of diagnosing luke warm hot water please

[tommydickfinger]

hi folks, im not a plumber so please be obvious in any advice given,

Symptoms, hot water used to scold you when on hot maximum,now the water flow rate has to be turned down to a minimum just to be luke warm.

Known facts/faults.

heatline combi 6 years old. pressure vessel not pressurised to manfactures recommended. have the instruction booklet so can do any tests that require manufacturers tolerences.

kind regards

tommy

 

[sooey]

In cold weather the combi can't raise the water to the same temp as it can in summer, simply because the incoming water is ten or more degrees colder. The smaller the combi you have, the more obvious the difference.

 

[gavinda]

check your flow rate versus temperature rise. that will tell you if the boilers in tolerance. you just need a flow cup and a thermometer.

 

[tommydickfinger]

thanx sooey and gavinder- but theres def a fault- the waters barely tepid whilst in the shower- and of course its been in longer than just 1 year so know the performance is not constrained to it being winter- again please be specific in any tests you suggest- kind regards

tommy

 

[sooey]

The first test to do then is to let the heating circuit go cold, then run a hot water tap with the heating off. See if the flow pipe to the heating circuit under the boiler gets warm.

 

[tommydickfinger]

will do sooey- is this to diagnose hydroblock? (think its called that?) the bit that directs the hot water to my taps( in around about way) bit with the flangey-m-bob

kind regards

tommy

 

[gavinda]

excactly

this'll let you know if your diverter is letting by to the heating circuit.