GE LTC MAP User Manual

5-2 

Table 5-1: Common Troubleshooting Procedures (Cont’d) 

Incorrect Tap Position 

Displayed/Recorded. 

Sensor Input and Sensor Common  

connections reversed. 

Battery supply for OEM resistor string 

not stable or floating to ground 

causing a ground loop. 

Disconnect inputs and test voltage on the wires 

with a volt meter referenced to earth ground. 

Disconnect inputs and test voltage on the wires 

with a volt meter referenced to earth ground. 

Cut or remove the strap for Sensor Common input 

to chassis ground connection on the circuit 

board. 

Use a DC voltage from the monitor, rather than a 

battery, to supply the OEM resistor string. 

Heater ON at ambient over  

60 ºF (15.5 ºC). 

Faulty heater. 
 

Disconnect heater from I/O board; contact Reuter-

Stokes, Inc.. 

Heater not ON at ambient under 50 ºF 

(10 ºC). 

Faulty connections. 

Check heater connections.