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OJ Troubleshooting, GFCI Flash codes, Specs, and Theory Of Operation

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What are troubleshooting procedures for the OJ thermostats?  How do the heating cycles work?

See attached sheet.

Here are the GFCI Flash Codes:

The red LED on the right of the thermostat can indicate four different GFCI/EGFPD
states:
1. LED off – NORMAL state.
2. LED flashing slowly (once every two seconds) – TRIGGERED state. Try pressing
the “Standby/Reset” button on side of unit to reset the GFCI/EGFPD.
3. LED flashing quickly (five flashes per second) – ERROR state. Try switching the
power off and then back on again. If the thermostat re-enters ERROR state, either
the wiring is wrong (a ground-neutral short exists) or the unit is defective and
must be replaced.
4. LED lit constantly – Internal microprocessor malfunction or abnormal hardware
fault! Try switching the thermostat off and then back on again. If the LED still
lights constantly, the GFCI/EGFPD is defective and the thermostat must be
replaced.
Note: The LED lights up briefly without flashing during every power-up.


OJ POWER MODULES TROUBLESHOOTING:

When thermostat calls for heat it closes a contact between A & B. There are no voltage being sent to a power module.

Written by Scott Rosenbaum
Posted on
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