the internal mechanism has likely failed and requires replacement
The factory-calibrated setpoints are precision-tuned to open at 10 PSIG and automatically close at 32 PSIG
as well as specific electric furnaces like the 3144030
Automatic Thermal Protection: Features an auto-reset function that restores operation once temperatures drop below 115°F
Industrial Build Quality: High-grade insulation protects conductors against moisture
Johnson Controls A19EBB-1 Temperature Control Els PW 17895 the internal mechanism has likelyTemperature, Mechanical, 24 to 277Vac, SPST, Open High, Automatic Reset, 100 to 350 degree F Setpoint Range, 9 to 36 degree F Adjustable Differential, 240 to 350 degree F Adjustable Dial Stop, 6" Liquid Expansion Bulb, Warm Air Temperature Control with Knob Range Adjustment and Duct Mounting Flange This item does not qualify for free shipping.