[A/S] Re: Intermittent furnace fault

["nickcrowhurst <NickandSandra@xxxxxxxxxxx>" <NickandSandra@xxxxxxxxxxx>]

The problem persists, but I've found that the fault only occurs after 
the system has cooled right down for several hours. The furnace will 
light when the start cycle is re-done. Once the system starts, it 
will continue to cycle correctly in response to the thermostat. 
Yesterday I got my digital voltmeter to it in the failed condition, 
and established that 12.3 volts were on the ground side of the limit 
switch. Thus the sail switch, limit switch, time delay relay, blower 
motor, battery and thermoststat seem okay. The Suburban reply arrived 
today, suggesting a sticking gas valve. I'm buying one today and will 
fit it tomorrow. Whatever, I'm getting a Dinosaur board. It has all 
the features that I want. Diagnostic lights, 3 tries to ignite, and 
fuse protection are great. Have any of you used the remote mounting 
kit to get the board away from the heat? If so, where? I'm thinking 
of installing the board on the back of the wooden access hatch. It 
will still be warm, but at least it will be accessible without 
pulling the furnace. Thanks. Nick.