firing order

[eddiebrown424]

Morning and happy new year.

first off i am going to do a one to one boiler diagnostics course at woody's any thoughts? and also ideas on a multi-meter that is suitable for diagnostics.

the silly question is regarding the firing sequence. I thought that the diverter valve was closed and in central heating mode and a call for heat starts the pump to run activating the flow switch proving flow which then starts the ignition sequence i.e fan to run. However I am reading conflicting views that in

standby to fan

if there is no continuity/ resistance on the overheat stat no progression of the sequence will occur. I.e check overheat stat first.

this also confirms that the pressure and pcb is all ok.

Fan to ignition

Fan is ok
Air pressure switch ok
pump is ok

this indicates that the fan starts prior to the pump.

Any advice greatly received

Eddie

 

[stevetheplumber]

Re: silly question ---- Gas firing sequence

boilers vary in the sequence you need to look at each one seperately but generally pump is first provided there is water in the boiler

 

[Unregistered]

Re: silly question ---- Gas firing sequence

Thanks Steve saved my sanity lol...... Is it unprofessional to turn up with the MIs

 

[quality]

Re: silly question ---- Gas firing sequence

not at all

 

[Riley]

Re: silly question ---- Gas firing sequence

Not all there are several websites and apps that have links to loads of them

 

[lame plumber]

Re: silly question ---- Gas firing sequence

first thing I ask customer is where are their manuals, if they query the fact I just point out I want to complete the servicing record in them 🙂

 

[billybob150811]

Re: silly question ---- Gas firing sequence

be interested to know your views after you have been to woodys

 

[AlexGas]

Re: silly question ---- Gas firing sequence

This thread should be moved!