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Ferroli 77ff combi boiler, Intermittent problem effecting both heating and hot water. System can work fine for weeks and then fail. When the fault is present any demand for heat causes:- a) RL2 to energise, b) the fan runs and the pressure switch operates, c) then RL2 is deenergised the sequence a>b>c then repeats with a period of a few seconds. The fault can be "fixed" by moving the cables to the PCB or flexing the PCB however it always comes back. any ideas ? matt

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6ya6ya
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Posted on Jan 02, 2017

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proton77
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SOURCE: Need wiring diagram to include: Underfloor

Hi,
could you provide the exact model number or the product you need the wiring diagram for



Thanks
Proton

Posted on Oct 30, 2008

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  • 1 Answer

SOURCE: Is Ferroli Optima 701 a condensing boiler?

fraid not its pre condensing and my advice would be to chuck it in the sea 

Posted on Jan 08, 2009

  • 5 Answers

SOURCE: fan runs continuously

the air pressure which does not controll the fan it is a safe guard for the gas/oil burner to ignite nowing that the fan is running ( air switch normaly negative /positive prssure n/o,n/c circuits. it could be that your boiler is designed for a cant think of techinacal name but when in centre of house/factory and has 1 or more boilers connected to flue etc the fans run when only power to boiler is on , non vented system ? it could be a simple link to remove in controll panel i would phone technical help for manufacture ?

Posted on Feb 05, 2009

  • 13 Answers

SOURCE: hi,i have a vaillant turbomax

Which turbomax, as there a two different models. The more modern one, with the brass CPL diverter valve, located at the front left of the boiler, was very prone sticking & jamming, this would restrict flow through the hot water circuit in the boiler, and cause cycling. Vaillant actually modified the diverter. You can identify, if it is the old type, as there is a very small hole in the middle of the diverter on the old ones, probable no more than 1mm-2mm wide. The modfied one, is much bigger approx 5mm wide. If old type, replace as this usally sorts the problem

Posted on Mar 03, 2009

gasman44
  • 83 Answers

SOURCE: We have a Halstead Ace

Hi,

You need to get a qualified 'Gas Safe' engineer to check the Venturi in the flue, and clean it out. The other thing to look at is the igniters, clean them wirth emery paper as this boier relies on flame rectification (ignite and sense flame)

The other important aspect which also hasn't been mentioned is to check the inlet and working pressure (as i have had a faulty gas meter governor before)

Quite often the simple faults are overlooked and everyone goes for the PCB, It is doubtful it's a loose wire on the gas valve, The best advice is to get a gas engineer in and for him to call Halstead while on site.

Be very careful when working on your own gas boiler, as any mishaps, and your house insurance is void.

Posted on Jul 10, 2009

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