8
9.03 No Heat (cont.)
Troubleshooting Procedures
Problem Procedure
E. If a 5V DC power supply is not available, leave J5 connected
to the control board, turn power on, and repeat step D by
placing the voltmeter probes on J5, Pins 2 & 3.
4. Check Heater.
A. Disconnect unit from electrical supply.
B. Obtain access to the heater by removing the bottom cover
and then removing the insulation. The heaters have red and
white wires connected to them from the control board.
Disconnect the red wire from the heater to isolate it from the
board. Connect an ohm meter across the heater. Then using
the chart below, determine which reading you should obtain
depending on the model. On most of the 230-volt models,
there are two separate heaters which are connected in
series. The values below are approximate. If the resistance
varies more than ±20% from these listed values, then the
heater should be replaced.
280-120V 60 Ohms
280-230V 260 Ohms
281-120V 60 Ohms
281-230V 260 Ohms
282-120V 48 Ohms
282-230V 196 Ohms Total (98 Ohms each)
283-120V 35 Ohms
283-230V 140 Ohms Total (70 Ohms each)
284-120V 25 Ohms
284-230V 100 Ohms Total (50 Ohms each)
285-120V 25 Ohms
285-230V 100 Ohms Total (50 Ohms each)
286-120V 25 Ohms
286-230V 100 Ohms Total (50 Ohms each)
288-120V 35 Ohms
288-230V 140 Ohms Total (70 Ohms each)
Re-connect the red wire back to the heater.
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