In article , Kenneth W. Sterling wrote:
This group is knowledgeable about so many topics I though I'd ask
about a problem I'm having with a Trane high efficiency (condensing,
model TUX080) furnace installed in my house. Every once in a while,
the furnace gets stuck in the cool-down part of the heat cycle wherein
the flame is out and the blower keeps running until the microprocessor
is manually reset by turning the power off/on. This is particularly
....
can also glitch the processor so I am thinking of installing a surge
suppressor in the line input. One way would be to use a suppressor
typically used for electronic equipment such as computers but they are
plug in rather than permanent wired. Any comments on using such a
device (by installling a plug in the furnace line and plugging it into
the suppressor) would be appreciated, or, any other suggestions.

most furnaces _do_ have a plug, maybe you should check your local
code, hardwiring would be an unusual requirement. more likely the
code calls for a certain grade/type connector/jack and the electrician
saved time/money by hard wiring.

wrt to the spike arrestors, they probably won't help much. a ferrups
xmfr would be my choice. use both if you want. --Loren


Another possibility I don't want to think about is an intermittant
processor board problem (a replacement board is nearly $500 CAN with
no assurance that it will correct the problem).

TIA for any help............


Laurie Forbes
As an afterthought... Even though you "checked the
grounds", you may want to go over them again.
Remove the ground connections, clean the metal
and all areas that need to be grounded, then
re-attach and make sure they are secure. Grounding
on this type of equipment can be critical and even
though they may seem snug, cleaning and re-doing
them may solve your problem.
Ken.