Intermittent hot water with a heatline boiler?

Saf - did you manage to remove the dhw sensor ? We would like to know.

nik
April 2017

If you are suffering from hot and cold water fluctuations on a heatline Monza combi boiler then check the following FIRST.
If when you turn on the hot water you can hear the boiler fire up with the fan at high speed then do the following to fix it without tools.
1: Hold Mode button for 7 seconds,
2: Use + or - to show 35 on display,
3: Press mode,
4: Use - to show 96 on display,
5: Press Mode,
6: press + or - to show 1 on display,
7: Press mode,
8: Wait 3 seconds,
9: Press mode button for 3 seconds or press the small reset button.

Now try the hot water again, if the boiler fan starts at a lower speed then your problem was corrupt Eeprom on the main PCB.

Basically the boiler is trying too hard to heat the water, the out sensor is seeing the quick rise and shutting down the heat, then it detects the fall in the return and fires the boiler back up again in a never ending cycle.

This also affects the Heating.
If you look at the display and the temperature rises quickly then the boiler shuts down and then fires up again the reset should cure it as long as the sensors, pump, diverter or heat exchanger is not the problem.

Refference: http://www.heatline.co.uk/wp-content/uploads/2013/09/Monza-24-and-28-Instructions-for-use.pdf.

The bloke I fixed this for was charged £70+vat by "the professionals" and was told he needed a new pump at £400 fitted. I fixed it for two cups of coffee and a sticky bun.!! And I told him not to pay the £70+ invoice as the monkeys did not deserve it.

Hope this helps you .
Hv.

Hiddenvision
September 2014

Trevor December 2012 has the answer! Took the secondary heat exchanger off and soaked in cococola and we now have a magical hot shower. Well done trevor and thank you!

tressa
November 2013

just to let everyone know, Glow Worm have now taken over Heatline boilers and guess what, their engineers dont know anything about Heatline boilers... what a suprise.
Im on my 3rd engineer visit in one week trying to diagnose the same problems. i will try all the suggestions myself and hope one works!

S Sharpe
June 2013

Heatline "I hope" have gone bust! No help form call line.
Boiler installed for 2 months before problems.
No help from installer what so ever!!!
If you're having your boiler replaced "buyer beware".

Andy B
March 2013

solaris 30 pc 4 years old problem with dhw only luke warm come out no matter what temp we set it at.

urgent please help.

many thanks

molineux
January 2013

I had the same problem and after 2 "plumbers" with their ideas failed to correct it I spoke to another who told me to turn the water on and put 1 hand on the secondary heat exchanger (small vessel at rear/base of the unit) and the other on the DHW pipe from the unit. If there is a difference there is a blockage in the heat exchanger.
I removed sid unit, washed in water and also filled with Coca Cola for about and hour. Many black flakes came out. I re-instated and everything workd perfectly. could be worth a try.

Trevor
December 2012

i had the same problem with my heatline, after changing flow switch and sensor it turned out to be the pcb at the end, we got one from ebay for less than half price from mhs.boiler.spares
they diagnosed problem for me
excellent customer service and technical knowledge
0121 449 0290

steve
May 2012

How do you actually disconnect the DHW sensor?

Saf
February 2010

I have a solaris 30pc this problem happens alot with me I take out the heat exchanger and wash it out as it is usually full of sludge.Its a pain but works everytime

sean
February 2010

I've got the same problem and found if I disconnect the DHW sensor, then the CH works and the DHW works fine.

If I reconnect the DHW sensor then the problem returns.

What does the DHW sensor actually sense?

pixelstone
January 2010

Link to heatline bolier manuals

http://www.heatline.co.uk/boilers/manuals/

pixeslstone
January 2010

heat exchanger plate must be filled with sludge.

ihsan
December 2009

pressure keeps going up

faz
October 2009

Definately the DHW flow switch on Heatline S24.

Rizwan
September 2009

it is the plate heat exchanger that has a restriction in the primary water circuit. A very common problem with this boiler

combi are easy to fix
July 2009

Hi Dan, did you sort the problem if so what was it!!! Ta Gary

Lionheart
May 2009

Dulwichdan. If you have a manual for heat line s24
could you please download it to me, I have a problem too but no manual.
Please email pdf to l.reeman@tesco.net
THANKS

L.REEMAN
March 2009

If boiler is in hot water mode only, does it fire up. If not check domestic hotwater flowswitch or possibly pcb.

360
February 2009

I have the same S24 w/m comb boiler heatline and I also have the same problem with the hot water.if you find out the problem before me pleases let us know..thanks
...Andy

andy..
February 2009

I've got exactly the same on a Solaris 30PC. I'm calling the helpline tomorrowto see what they say.
For Reference: 0870 777 8318 is the technical helpline.
Mine does have a 2 year warranty so it should be Okay. Will post back whan I know for sure!

j1cta
February 2009