I'm having an intermittent problem with
my boiler and I a hoping, really hoping,
someone can help me or point me in the
I'll try to give you as much info. up-front
as I can.
The Boiler is a Lochinvar Solution CB090
and is 7 years old. There are no options
(like Outdoor Air Reset), but I do have a
power vent and a GuardDog RB24E low
water cutoff and I am pumping away and
have followed all of Dan's advice.
The boiler is disassembled and meticulously
cleaned each season.
This season, after cleaning, the power-up
went as usual, except I noticed after a
time (maybe 10 minutes), the main burners
stopped, restarted, immediately stopped
again and restarted, but then stayed lit.
I would not have even noticed this, if I hadn't
been right there watching it. During the first
season start-up, I stay with it through a full
cycle to make sure everything is working ok.
I don't make a habit of willy-nilly replacing parts,
but I have spares of some things, so why not?
I have replaced the ignition module and the electronics
part of the power vent (the relay and vacuum
This made no difference.
As I was watching this afternoon, the boiler
came on normally and stayed that way for about
8 - 10 minutes (water temp was up to 140 if it
matters), then burners off, immediate restart,
burners off again and another immediate restart.
After the second restart, it stayed started.
When this happens, I can hear a "click" like a
relay sound, right after the burners shut-off,
but I'm not not sure exactly where it's coming
from. Also, the power vent motor stays on the
entire time, whether the burners are off or on.
Not sure about the pump though? Could the
"click" sound be the pump relay? Maybe I have
a weak pump relay?
Things worked as normal for about another 8 - 10
minutes and the same thing again. Off-on, off-on.
Water temp was 170 now.
Everything fine again for about 20 more minutes,
then the same thing again, but this time, the off-on was
three times instead of two.
Not long after this, the thermostat was satisfied
and the boiler shut-down. The off-on will repeat itself
If this was a solid failure, I could troubleshoot it.
Being intermittent, I have no idea how what to do.
Any ideas how I should proceed?
Thanks for all your help . . . . . Brian