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OM-203 185 Page 57
Check Flow/Limit light for illumination.
If light does not illuminate, replace circuit board PC1.
If light does illuminate, proceed as follows:
Check switch leads for continuity when switch is activated.
Check switch leads for open circuit when switch is deactivated.
If continuity is always present at switch leads, replace flow switch.
E. Heat On Light Does Not Display When Power Source Is Supplying Output
Remove IH/TS wrapper.
Check for 24 volts dc at LED (this LED is polarity sensitive, red mark on plastic lense is + side).
If 24 volts dc is present, replace LED.
If 24 volts dc is not present, another source rather than the IH/TS is energizing the power source. Check for a short
circuit between pins A and B in the 14-pin control cable.
F. Output Does Not Start When Run Button Is Pressed
Check for 5.br on 2408 Temperature Controller display.
Fully press and release Stop and Hold buttons, then try pressing the Run button.
If actual temperature is higher than target temperature, see recovery procedure in Section 6-3-5.
Remove 14-pin control cable from IH/TS.
Jumper pins A and B in plug on 14-pin cable.
If no output is present, proceed as follows:
Remove 14-pin control cable from power source.
Jumper pins A and B at power source receptacle.
If no output is present, consult power source Owner’s Manual for troubleshooting.
If output is present, replace 14-pin control cable.
If output is present, proceed as follows:
Unplug IH/TS 115 volts ac power cord.
Check Run, Hold and Stop switches for operation.
G. Pressing Power Source Select Button On Rear Of IH/TS Does Not Change Selection
Remove IH/TS wrapper.
Jumper across leads at Power Source Select button (dry circuit).
If selection changes, replace switch.
If selection does not change, proceed as follows:
Jumper between pins 1 and 2 at RC2 on circuit board PC1.
If selection changes, replace wiring to the switch.
If selection does not change, replace circuit board PC1.
H. 5100V Recorder Displays Channel Error
Recorder will not operate below 32° F, allow 15-30 minutes for warm up or move recorder to a warmer location.
Remove IH/TS wrapper.
Remove red cover on rear of recorder.
Check that terminal strip is secure on rear of recorder.