i have a potterton prima f 40 which will not light up. i have traced fault to the fan flue presure switch is not pulling in . i have replaced the switch , checked the pipes ,cleaned the fan but the switch will still not pull in.
i have also checked that the fan is running up to speed and that is ok.
anyone with any idea what the problem could be or how to repair the fault.
i have also checked that the fan is running up to speed and that is ok.
anyone with any idea what the problem could be or how to repair the fault.