Thermo set at 50 degrees and heater starts up and cuts off in a

Unknown

How long u been having the problem? Is the heating anicaptoir(sp) set, if the thermostat been "shorted", its will cycles erraticly...

Butch Manning

Heater starts up and cuts off

Thermo is set at 50 degrees and it will start up and run for a few seconds and stop then repeats

Butch Manning

it oil heat

it oil heat

Unknown

what kind

What kind of thermostat u have and is the heating ancicaptor set for ur heating unit?

Butch Manning

thermostat

honeywell
dial on top
thermostat on bottom

kevin coppinger_4

Do you have....

Taco Zone valves? kpc

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Butch Manning

fixed

It seems the eye is not seeing the flame

Jerry_15

Start out with a digital set-back battery op thermostat Cheap, easy, required by title 24, and effort not wasted even if it's not the problem. If you want to test the old one just turn it up to max when it's short cycling and see if you get a long burn out of it.