Lennox Merit MPE36 Service Manual page 40

Merit series
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Heater element wiring
Orange
Blue
Red
To test the heater element:
Turn off all power at the circuit breaker or unplug the power
cord (120VAC)
Remove orange wire, both blue wires, and both red wires from
the heater element.
With the multimeter set to Ohms: touch the probes to the
terminals from which the red wires were removed.
If the multimeter displays "1" the heating element has failed and
must be replaced.
Normal Ohm readings for the heater coil (red to red) is between
65 Ohms and 90 Ohms.
Be careful to replace all wires as shown in this picture.

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