Furnace thermostat

[mrkane1952]

Greetings All:

The LP furnace in the bedroom runs for 2 minutes, heating normally,
then cycles off for one minute, then repeats. I can find no wiper to
vary the "heat anticipator" setting, although there is a scale molded
into the body of the "Suburban" thermostat housing where I would
expect it to be.

The thermostat in the salon is the same, but that furnace does not
short cycle.

Any suggestions?

Thanks--

M.R.Kane
1985 PT40