Last week our pilot light went out. When we tried to relight, the
pilot would light but when I released the button it would not stay
lit, so I could not start the furnace of course.
A friend replaced the Thermal Couple for us and that seemed to fix it.
The pilot would stay lit in "pilot mode" then we could replace the
cover and start the heater as normal. We set it to the mid-way mark
(labeled "Hot"). Later that night, it went out again but we were
easily able to relight it. No problems since then until today, been
about 5 days.
The furnace is in an outside room off of our carport and it gets very
cold in there (uninsulated) so we put some insulation in today. We
used a water heater blanket, but only wrapped the top 3/4 of the
heater in order to avoid touching the control box or getting anywhere
near the pilot area. When doing this, the pilot went out so we turned
off all the gas, just to make sure we didn't have any problems. After
we were done, we relit the heater.
This time, the pilot worked fine but when I put the gas control knob
into the "full" position and then used the Temp dial to get the
furnace to light, rather than catching at the lower temp area (several
lines under "hot"), it wouldn't catch until 1/2 way between "hot" and
the max setting. Now, if we try to set it down midway to "hot", which
is the recommended setting, the heater doesn't stay lit, although the
pilot does. So, we took off all the insulation, checked to make sure
the thermal couple wasn't loose or damaged and can't find anythign
wrong, but we cannot set the furnace lower than 1/2 way between "hot"
and max. This troubles me because last week when we replaced the
couple, it could be set a lot lower if we wanted.
The furnace was made in 1996. We bought the house in June '02 and have
had no problems, outside of the hot water not lasting as long in the
winter as in the warmer months. But since we're in Arkansas, we don't
have much cold weather, so it's not been a huge bother.
Any advice? Should we call out a plumber to look at it? Is it okay
that it doesn't catch until this setting?