<<There is no way to troubleshoot a system over the internet>>
I appreciate your concern, but that depends on the technical background
of the person seeking help.
I know enough about sensors and control systems and electronics; I just
needed some info about how the system is supposed to work.
I got the help I needed from another newsgroup. All I really needed
was the sequence of operations. I'll post it here for the benefit of
- control tests the vent prove switch (vacuum switch attached to vent
motor). must be open. if not, flash error code and refuse to ignite
- control powers up vent motor, delays for a moment, then tests vent
prove switch again. must be closed. if not, flash error code and
refuse to ignite.
- control tests limit and rollout switches. if open, flash appropriate
error code and refuse to ignite
- control powers igniter, waits for it to heat up, then opens gas
That's all I needed to find the problem. It was an open circuit in the
ignitor heating element. I replaced the igniter (cost: $33) and
everything is working fine.
*I'm still a little unsure of this last step, and if a knowledgeable
person could could shed some light on it that would be appreciated.
Which of the following is the correct description of how the 50A50-206
a) control powers igniter, delays for a fixed time interval to allow
igniter to glow, opens gas valve, then depowers igniter and uses it as
a flame sensor
b) control first tests the igniter and refuses to open the gas valve if
an open circuit if found; then proceeds as in (a) above
c) some other control approach ??
I tried the white-rodgers website, but the model 50A50-206 is
discontinued, and they didn't have the charity to keep the info for it
on their website. I was hoping someone had it, or knew of a website
where it was archived.