Normal Operation for York Furnace?

[deecee]

Helping my bother trying to solve the strange operation of his 1 year old Furnace.
It is a Unitary Products Model GF9S100C16VP11G. Everything seems to be operating correctly, but the burner keeps cycling on and off during a call for heat with the thermostat not satisfied (Honeywell Heating/Cooling Mercury model). He just started it up for the season and he seems to think it did not run this way last year. The LED on the control board is Blinking Amber while the burners are on then flashes Green when they are off. The discharge air is warm but does not really seem to be heating the house sufficiently. The burners never seem to be on for more then 2 minutes at the most, then will restart after a minute or so and continue with the same on and off frequency. The inducer blower is starting and stopping as well but the main blower stays on. Does this seem to be correct operation?


Paul

[amd]

Not normal.

Check the filter and open all registers. If this is a high efficiency furnace, make sure that the outdoor exhaust and inlet pipes are unobstructed.

If problem still persists, call the installer back.

[beenthere]

Not normal.

Call the installer out for service. If its been less then a year, you should have a labor warranty from the installer.

[6448craig]

It could be your heating anticapator in your mercury thermostat. Sorry can't tell you how to check it, site rules.

[deecee]

Thanks for the thoughts. Update: Unfortunately, the labor warranty ended in September, however, we did a simple check of the vent and fresh air pipe (all good) and upon further discussion with my brother he replaced the electronic thermostat he had with the Honeywell during the summer. Apparently, he did not like programming it or lost the instructions on how to program it. He would not admit the reason. Anyway, he neglected to set the anticipator to the correct setting (it was all the way to the low end) which does not surprise me since he did not know what it was. After setting it to the correct value as listed in his documentation the furnace is working normally now. I personally had no idea the anticipator could affect the operation of the furnace like it did. Which begs the question...could it still be something else?

Paul

[BaldLoonie]

The fact that the inducer is cycling makes me think it was external to the furnace. Cycling on limit usually keeps the inducer on. Since the furnace is OK now, further proof it was anticipation problems.

[beenthere]

What baldie said.