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Servicing the Heater:
The following will help you find any problems that may occur in the heater unit and includes tips for
repair. For servicing of electrical systems, open the control box cover. Inside the cover you will find a
wiring schematic to help you service the unit. In the checks shown below, locate the symptoms you are
experiencing with your unit and follow the list of corresponding possible causes and remedies:
Note:
Unless otherwise indicated, checks are made with the power off using a voltmeter on resistance
setting.
Generic Sequential Operations Check:
1. Lack of power going to the unit (check made with power on).
a. Take a voltmeter or continuity tester, put one lead to ground and the other on the top
terminal of terminal block in fan control box. Power lead is the black wire on the top
terminal (#1) on the terminal block. When the fan is operating, it should indicate 115
volts on the voltmeter or the light should come on using a continuity tester.
2. Improper Neutral.
a. Verify neutral wire is connected to the terminal block in the fan control box. Neutral to
be provided from disconnect to fan control box with the power supply.
3. Fuse may be blown.
a. Visually check fuse. If dark in color, replace.
b. Check fuse and holder. Put one lead on each side of the fuse on the fuse holder screws.
Meter should show continuity through fuse.
4. Check for power at toggle switch in heater (check made with power on).
a. Put one lead of voltmeter to toggle switch where power cord is connected and the other
lead to ground. If there is not any power, check cord and fuse for damage.
5. Flame probe may be in an open condition.
continuity of the Flame Probe each time the heater is started. If the Flame Probe is in an open
condition, the Flame Probe will prevent heater operation. Verify all wires are connected
properly.
a. Use a voltmeter and check for continuity across the flame probe. If no continuity is
present and the flame probe has cooled down, replace the flame probe. Check the wires
to the flame probe. If they are damaged replace the flame probe wire.
6. Thermostat or Humidistat control may be open.
a. Use a voltmeter and check continuity across the terminal block where the 2 leads of the
control are connected (terminals 6 and 7).
b. If no continuity is present, check the control setting to call for heater operation. Check
for damaged wires to the control. If either wire is damaged replace the wire. Replace
entire thermostat or humidistat.
7. The vapor limit switch may be defective (LPGE units only)
Chief Industries, Inc. 800-359-7600 MAINTAINENCE - 416274
C E N T R I F U G A L
Note:
The heater control is wired to check the
H E A T E R
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C S A
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