
1000XL / SunTwin 1500 Elite Troubleshooting Guide
Page 1
oAlways perform initial inspections including visual, current and airflow (Figure A) tests before servicing a heater.
oCheck the AC cord, wires and plugs, for cut, pinched or exposed wires, secure connection and proper location.
oNEVER touch the glass portion of a heating element. Always visually inspect the elements and perform a resistance test.
oThe heating elements are wired in 3 parallel circuits and are suggested to be replaced in pairs for this reason. (FIGURE B)
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oCurrent: 12.5 –14 amps in “HIGH” mode
oAirflow: 640+ FPM
oPower: 1500 Watts
oHeating Elements (Bulbs): 14+/- 5%
oHeat Rise: 140(over ambient temperature)
oCheck (in order)
1. Power transformer
2. Front control board (and fuse)
3. Heat sensor (high limit switch)
oIf the heater turns on then immediately off, inspect the thermostat sensor, its wires and connection.
oInspect the wiring and cables and their connections including the AC cord and its ground.
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oVisually inspect the heating elements and their connections. Turn on the heater and look for non-working elements.
oTest the resistance of the heating elements. They should measure 14+/- 5% (13.3–14.7).
oReplace a heating element if the glass or the ceramic ends are cracked or broken, overly discolored, if the quartz element
appears to be damaged or if the wire insulation is excessively whitened (more than 1/4”) near the bulb. (FIGURE F)
oTest the unit with a new thermostat sensor.
oRemove the leads to the high limit switch and perform a continuity test. If any resistance, replace.
oTest the unit with a new circuit board.
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oCheck the fan to make sure the fan is spinning freely, properly aligned and not binding.
oVisually inspect the fan for built up dust and dirt. Clean it with a firm-bristled brush and vacuum.
oInspect the fan bearing and oil it if needed.
oTest/replace the fan sensor.
oTest/replace the high limit switch.
oVisually inspect the fan to make sure the cage and motor are properly mounted, aligned and spinning freely.
oInspect the fan bearing and oil it if needed.
oInspect the fan bushing. Make sure it fits tightly in the blower fan and on the motor shaft.
oIf the fan continues to make noise, it may be bent or out of balance and need replaced.
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