fga on an open flue boiler

[markinaark]

working on an old potterton famingo

getting a high ration ie above .008
gas rated within spec
burner pressure within spec
cleaned out heat exchanger etc
still getting a high reading.
no carbon sooting etc no spilling ,
looked clean even though not touched/serviced in years,
could problem be due to not getting flue probe , 20 cm up beyond draught diverter.
any suggestions/tips welcome.

 

[Puddle]

probably due to cast iron heat exchanger on flamingo,same problems as below

http://www.ukplumbersforums.co.uk/gas-safety-register-forum/17546-ideal-e-type-cf.html

 

[archiedale]

on old appliances i don,t use a FGA, pressures, gas rate and visual.

 

[SafeGasInstall]

i start doing part of service/ landlord/install/any boiler work actually CO in the boiler room

 

[markinaark]

thanks , (very informative response.)

 

[SimonJohns]

What were you actual co2 and O2 co readings