No hot water without on-peak?

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No hot water without on-peak?

Post  Michalis on Mon Mar 24, 2014 6:49 am

Hi, I have the a class model of this boiler and have an interesting issue. If I set the timer so only off peak is on during the night, in the morning there is no hot water. If I set on-peak to run overnight as well, there is hot water. I think this is strange as I thought on-peak only made a difference if the boost button is pressed. Is this not the case?


I've checked the resistance of both elements and they're both around 18.6 ohms so seem OK.

Michalis

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Re: No hot water without on-peak?

Post  mike on Mon Mar 24, 2014 11:32 am

A class
Should have Off peak supply.
And on peak supply to work the unit (pump etc)
And the boost via black button on the front.
What have you got?
Mike

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Re: No hot water without on-peak?

Post  Michalis on Mon Mar 24, 2014 1:18 pm

I have an off peak supply (from 11pm to 7am),and an on peak supply on a timer I can control.

I also have the boost button on the front.

When you say 'on peak supply to work the unit', surely the off-peak supply can also work the pump otherwise how would hot water arrive during off peak times when on peak is off?

Michalis

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Re: No hot water without on-peak?

Post  mike on Tue Mar 25, 2014 5:15 pm

If you look in the book / manual.
Down load for free from Gledhill if you have not got one.The off peak supply only heats the bottom heater up.
The ON peak works the pump, scale reducer if fitted.
The sensors and the main board.
On peak will also heat the top heater if required.
Boost will NOT work if the unit is hot enough.
If your unit is NOT hot.
Then press the black button on the unit.
Also try setting time clock on the boost function.
If it is a Grasslin timer you press the dial in.
If you look in the book and how to wire these units in you will see there are options.
The better way is to have;
Off peak supply from an off peak supply / consumer unit. No timer. Unit on and heats up during the E7 or E 10 period.
Will heat up and switch off when the unit is hot enough.
And an On peak supply.
But these units will be wired in different ways depending on your location and who does it.
I could write lots more, but it can all be found in the section for PC A class units on here.
I would suggest you speak to a few neighbours and ask them how they use theirs.
And they even provide you with someone whom they use / trust whom they use to repair the units.
Mike

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Re: No hot water without on-peak?

Post  mike on Tue Mar 25, 2014 5:16 pm

Oh and if you have took readings of the heaters.
Try taking some of the clock too.
Mike

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