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Heat exchanger overheating boiler locking out no ch or dhw?

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Hi,
There is probably a sensor that in bad or the brain went wacky...but to really help you I need to have a make and model of your boiler...from the code it sounds like a Weil McClain Ultra but others could have the same coding...
Did you try to reset it??? Is a pump bad???
This may take a hands on look to find the exact cause...

heatman101

Posted on Aug 25, 2010

  • killayjack Aug 27, 2010

    Worcester Geenstar 28i junior condensing combi boiler, it will fire up,after 10-15 seconds shutdown heat exchanger too hot to touch. No ch or DHW?

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Posted on Jan 02, 2017

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I HAVE WORCESTER 24SI BOILER , THE HEATING IS WORKING BUT NO HOT WATER THANKS.


Hi Mustafa, you are going to need a Gas Engineer to fix this one. It could either be the Hot water sensor or the flow switch that activates the water to come on. Good Luck.

Jan 03, 2015 | Water Water Heaters

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I am wanting to wire a Baxi 105E boiler to a Danfoss 102 mechanical timer. The boiler has 5 wires = red, blue, earth, black and yellow. The Timer has six terminals = 1 DHW, 2 HTG, 3 COM, I (earth), 5...


1) Contact baxi:
http://www.baxi.co.uk/contact.htm

2) Which boiler wires? I don't know. Page 24 manual.
Manual says to disconnect link between terminals 1 and 2, and instert timer in-line.
http://www.acwilgar.co.uk/Boiler-Manual-PDF/Baxi/Combi%20instant%2080E%20&%20105E.pdf

2) I can tell you about the timer wiring.
Timer is 230Volts
Not sure if you have British Hot-Neutral 230Volt, or Hot-Hot 230Volt.
Wiring is same 2 wires, but words to describe are different.
Let's say you have Hot-Neutral 230V
Connect Hot to L6
Connect Neutral to N5
This will power the timer so it runs and keeps time.
You can get Hot-Neutral wires from Hot-Neutral that arrive to power the boiler.

Now the timer terminals are separate.
E terminal is Earth or ground.
The Common is Hot wire.
The timer then turns on-off and switches back and forth between DHW and HTG.
HTG is heating
DHW is defrost.
Timer has 2 sets contacts.

When timer activates first set of contacts, then DHW defrost terminal receives power from Hot wire on Com terminal. At this time, all power is cut to HTG heating terminal.

When the defrost cycle ends, then the heating circuit receives power, and then the timer has programming that opens and closes a second set of contacts going to HTG heating terminal.

Which wires from boiler connect to each terminal, I am not sure.

Feb 03, 2013 | Hardware & Accessories

1 Answer

Water to hot for gas boiler boiler gos off


It could be dyslexia, but I think you want to know what may be wrong with your boiler in this case!
This is a VERY old design. The diaphragm is on the water section, this operates a switch to turn ON the pump, and a further device causes the diverter valve to divert boiler water from CH duty to HW duty.
From your description it appears that the boiler is shutting down on internal boiler water temperature (too high), your 'briefly too hot' HW symptom may be caused either by the boiler side of the secondary heat exchanger being blocked/caked in sludge, OR the DHW side of it being scaled. Either way a new or replacement (descaled) secondary heat exchanger MAY inprove things. It's not easy on these old clunk-pots, and EVERY disturbed seal will subsequently leak, so get a good supply of o-rings and fibre seals before you start ("you" being the competant fitter you employ)

Dec 20, 2012 | Water Heaters

1 Answer

Ideal boiler no heat to radiators but hot water still working


check the divertor head and valve.
sounds like it ist adjusing from dhw to ch.
take head off(remove pi at back,or side pin) and push pin in valve when calling for ch,if it works then the head has gone.

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I have a BAXI combi Instant 105 HE bolier. It has been very cold for the past week and the hot water is not working (though the heating is). I have cleared the overflow flu pipe of ice but this has not solved the problem. Any suggestions?

Sep 16, 2009 | Combi Centre DX - Mango

1 Answer

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if the boiler fires when the tap is opened then the diverter valve is working ok it must be a blocked plate heat exchanger which is the stainless steel rectangular block inside the boiler connected to the pump and the mains cold water.
it will be blocked on the central heating part probably with black scale. it is possible to clean out but sometimes it is better to just change the plate. but remember to flush the system as well or the same thing will happen.

Dec 14, 2008 | Water Heaters

1 Answer

Ariston micro genus combi boiler central heating works okay but domestic hotwater fails to rise but burners seem to be lit and the boiler doesnt appear to cycle dhw temp gets to about 30 degrees instead of...


having found a circuit diagram, realised that the divertor valve was electrically operated.i unplugged this then unclipped the motor from the valve body,the diverter valve is spring loaded and once i'd removed the motor the spring raised the valve to divert water through the dhw heat exchanger,giving us hot water but no heating, if i refit the motor the problem comes back heating no dhw.ordered new motorised valve assembly £30 next day order .
this was a simple fix without having to drain the system down.

Dec 07, 2008 | Heating & Cooling

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