MYSTIC
TROUBLESHOOTING
30 Samuel Barnet Boulevard
New Bedford, MA 02745
(508) 995-2200
If at any time the temperature reading seems to be giving you difficulty,
prodeed as follows:
At the back of the indicator, disconnect the sensor wires from
terminals #4 and #5. The current temperature reading should
drop to -40 F (-40 C) or below. This is the normal open circuit reading.
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Remove the instrument from the wall.
Use a jumper wire (a paper clip will do) to connect across the sensor
terminals #4 and #5. The indicator should read 122 F (50 C). If so,
disconnect this jumper and proceed to the next step.
Use a jumper to connect between terminals #3 and #4. The calibration
test point has been hand-written on the back of the Indicator just above
terminals #3 and #4.
If the indicator is in proper working order, it will read within 2 F of this number. We
recommend you mount the instrument back on the wall in this mode for several
hours and observe it periodically. This will help detect most intermittent problems.
If the indicator registers within 2 F of the test point, the problem is in your sensor or wire.
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