GV 90+ 4 problem solved

tomkimes

Just wanted to post a recent problem I had for everyone’s benefit.

my GV 90 + 4 series 1 boiler wasn’t firing.  It would attempt to fire up 3 times and then the power and flame lights would flash.

My technician and I went through all the regular diagnostics like...
Check for loose electrical connections
Check igniter
Check gas valve (voltage and gas flow)
Check for blockages in air intake and exhaust
Check pressure switch
Check hoses connected to pressure switch
Blow through all hoses to check for blockage
Check and clean burn cone
Check orifice plate and hose ports for blockage
Check RPM of induction motor
Check recuperator for blockage

Is that everything?  Can’t remember.  We felt like we looked at everything.

Then it happened.  My tech disconnected the gas tube between the gas valve and the air manifold.  He put it to his lips and blew through it.  We heard a pop!  He blew through the other way.  We heard a pop again!  Nothing ever came out of the tube.  But it was definitely a blockage.  We figure spider web or spider egg sac.
Problem solved.

Hope this helps someone else!

motoguy128

Our standard procedure on and inducer draft combustion furnace or boiler is to blow out all
tunes and drain hoses as part of preventative maintenance and troubleshooting.  

However ill admit they I don’t always blow out the vent tube off the gas valve regulator.  Most gas valves don’t have them anymore.