i have a sirrus radiant gas boiler which will not ignite ,it starts up the fan runs the boiler goes to start up but cuts out and the 70degree t/s light flashes.i checked the manual and it says high limit thermostat lockout.how do i change it or reset it?

philip, January 2009

Dear Phillip,

Had the same problem (3 weeks ago) with a Radiant/Sirrus Wallhung (non-condensing).
At first, thought it was a faulty gas solonoid until it was
a) tested with a continuity meter, and then
b) substituted/replaced.
In the end the main control PCB was replaced.
Working reliably ever since. rgds

Aiden Scanlon. Dublin, Ireland, March 2009

i have the same problem with the same boiler, any suggestions would be appreciated

cb, March 2009