Temperature (°F)
Resistance (Ohm)
95
0.30
100
3.80
125
4.60
150
5.50
175
6.40
200
7.90
225
8.40
250
9.70
275
10.90
300
12.40
325
13.80
350
15.10
375
17.00
400
18.40
425
20.20
450
21.30
475
23.30
6
TROUBLESHOOTING THE THERMOSTAT
Temperature reading is incorrect,
showing a sensor error,
or
LOAD LED is switching at the
wrong temperature.
• Sensor or controller may be bad.
Sensor connections may be bad.
• Controller is wired incorrectly.
Place a jumper wire across the
thermocouple input terminals. The
display should indicate ambient
temperature. If it does, the
controller is ok. If not, replace
controller.
Decrease set point below ambient
temperature, LOAD LED should be
off for heating controllers. If it is, the
controller is OK.
Increase set point above ambient
temperature. LOAD LED should be
on for heating controllers. If it is, the
controller is OK.
Verify proper wiring. Call 1-800-
KEATING for a diagram.
Temperature reading is decreasing,
but actual temperature is increasing.
• Thermocouple polarity is reversed.
Red wire denotes negative wire.
• Ambient temperature in the control
cabinet is over 70°C.
Check thermocouple connections.
All connections, including extension
wire, must maintain the correct
polarity. Correct if needed.
Measure temperature in cabinet to
ensure it is below 70°C.
For troubleshooting the thermocouple, use the chart below
