Technical Reference Manual-XPM3m Revision Date: August 2014
PROCEDURE:
1) Disconnect ALL POWER to the Oven.
2) Check for Tripped Heater Circuit Breakers, (F8 & F11 are not heater circuit breakers) If a circuit breaker is
tripped (open), (See 10, and 17 in the Heating System Diagnostic tree)
3) Open ALL Heater Circuit Breakers: F1-B to F12-B and F1-T to F12-T (Depending on Oven size, the highest CB
No. may not be 12 as shown in the illustration on the next page)
4) Perform Resistance Checks. See “HEATER ELEMENT RESISTANCE REFERENCE CHART” (Oven Type &
Voltage must be known) See “ HEATER RESISTANCE CHECK LOCATIONS” and connect Meter (M) on CBs
and SSRs as shown.
A) If the resistance is “infinite” (open), the Heater may have a broken/disconnected wire or the heater
element may have an “open” in it.
B) If the resistance on Parallel wired Heaters - (see “CHART”, Fig A)- is twice what it should be:
1. One Heater element may be “open”
2. One conductor from the Heater may be disconnected.
3. The jumper from term (1) to term (1A) may be missing or loose.
C) If the resistance is in agreement with the “HEATER RESISTANCE REFERENCE CHART”, then it is
reasonable to expect that the Heater and its conductors are in proper operating condition.
5) Close ALL Heater Circuit Breakers.
6) Refer to “HEATING - Problems and Possible Solutions” for other possibilities.
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