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Fault code d4 keeps coming up when my boiler stops

Boiler work for about 20mins then trips out showing the d4 code

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: require room thermostat for ferroli combi boiler

Get a Ferroli wireless programmable room stat. City plumbing supplies can get hold of them but you'd be looking at approx £130. Part number 30800009. No wiring involved, the receiver connects to the boiler pcb. Had same problem but now fine.

Posted on Mar 12, 2009

  • 1 Answer

SOURCE: have a problem with a laars mini therm ii boiler. the pilot keeps

hi. i have mini temp boiler 150 btu 5yers old . it is burning with know radiation .it is up to thempitio .but it will not shut off.flame is good radietor is hot ,help?

Posted on Jan 05, 2010

  • 58 Answers

SOURCE: Vaillant Combi boiler

LOOK ON ONE OF THE COVERS 75% OF ALL CODES ARE ON THE INSIDE OF A COVER FOR SERVICE TECHS, NOT MUCH HELP BUT HOPE IT LEADS YOU DOWN THE RIGHT PATH

Posted on Jan 23, 2010

  • 36 Answers

SOURCE: boiler is a baxi control for heating is honeywell.

this will be your diaphram inside your divertor valve.
the one that looks like a spaceship.
it will e split.

Posted on Jan 31, 2010

  • 2464 Answers

SOURCE: I have a Vaillant ecoTech central heating boiler

f76 over heat protection triggerd on heat ecxchanger , check water leval of just google vaillant fault codes

Posted on Jun 03, 2010

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1 Answer

I have a baxi combi boiler which wont start and trips the electric..plumber has changed fan,ignition and now pcb to no effect...help!


Start by diconnecting main supply to Boiler (at the boiler input) and see if it trips the electric. This would point to fault in wiring from board to boiler.
Then check several points with meter to find short-circuit.
If not, then you have to TURN OFF THE GAS SUPPLY and connect and disconnect items such as solenoids, switches, board etc; until you find what causes it to trip.

Nov 18, 2014 | Heating & Cooling

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My Smartfit room unit is showing no fault codes but boiler wont cut in I have no power at PL in control box or at L on boiler


Boiler make and model????

To which control box do you refer? The system junction box? Boiler junction box?
No power at L (line?) on boiler (and this is why the make and model is important) means boiler should show no signs of life at all, but then it's boiler specific, some have 3 wire power (L,N,E), others have an extra terminal called something like SL.

Jan 21, 2013 | Heating & Cooling

1 Answer

I have a Vaillant ecoTech central heating boiler which has stopped working & is showing fault code F.76 Anyone know what this means please? Thanks


f76 over heat protection triggerd on heat ecxchanger , check water leval of just google vaillant fault codes

Jun 03, 2010 | Heating & Cooling

2 Answers

Fault code ( nocn ) on a ferroli boiler


if nocn is on the time clock then check the wiring to time clock and if all good then it is the time clock at fault and will need repleacing

Apr 25, 2010 | Heating & Cooling

1 Answer

Boiler pressure


If there is no leak anywhere in the system [pipes & radiators] Check the emergency pressure relief valve. It usually is at the base of the boiler and drains to outside [15mm pipe] where, if the valve leaks, water drips can be seen.. Looks similar to the picture with your query
Renew the valve
You can take it apart and clean it but I've never found that to be successful in the long term

Dec 29, 2009 | Watts 3/4 Pressure Relief Valve

1 Answer

I have an ideal standard he30 boiler instaledi have an ideal standard he30 boiler instaled about 6 weeks ago. the boiler keeps losing presure about half a bar every 2 days if i dont top it up it will trip...


Hi,
You have a problem that the installer does not know how to fix so they are just stringing you along hoping that you will give up and find some one else or forget about it..
You need to tell them to
1. fix the boiler correctly
2.take it back out and give you a new one at their expense
3. or tell them you will call another comapny to fix it and will give the bill to them to pay.
You did not get what you have paid for... do not pay them any money to come out and troubleshoot the boiler.
The boiler should work as the instructions say or someone did something wrong...
Sometimes it is best to call the boiler company and talk directly to their Tech. Support people.


I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

Dec 24, 2009 | Heating & Cooling

1 Answer

I have an ideal standard he30 boiler instaled about 6 weeks ago. the boiler keeps losing presure about half a bar every 2 days if i dont top it up it will trip the fuse on the fuse board acording to the...


All the combis I've come across merely fail to fire if the pressure is not up. not only do they not fire, nothing else works including the pump and in any event the pump should not overheat just on low pressure.
water loss - try turning off the valves on the flow & return pipes [3/4 inch ones] 1 valve per pipe . This will isolate the rest of the system - rads etc Note pressure over a time period. In this mode the hot water circuit will still work but do NOT use the heating circuit
1/2 bar over 2 days is not serious but it should be found
Once you have either mended the leak in the rest of the system or found there is not one, insist on a replacement boiler
In any event having looked at the reasons given for the fuse blowing, I would definitely get a replacement.
These problems should not happen on a new boiler
I list Worcester.-Ariston-GlowWorm-Ideal- and many others who would confirm this

Dec 24, 2009 | Water Heaters

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