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Publication No. 1-07-184
 download this Tec-Note in PDF format
Pages: 1, 2, 3, 4, 5, 6, 7, 8
A common problem
Faulty electrical connections are common causes of mod motor malfunctions. Faulty connections can be caused from loose connections, dust, or corrosion from moisture. Connection problems may occur at the following locations:
- Terminals in mod motor. (Figure 5).
- Terminals on Temperature controller (Figure 6).
- Terminal strip on back plate of heater panel (Figure 7).
- Terminal strip in burner junction box (Figure 8).
Other problems
- Failure of resistor board or resistor harness (Figures 11 and 12).
- Slippage of cams (Figure 2).
- Failure of transformer (Figure 2).
Figure 5. Terminal connections in mod motor.
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Figure 6. Terminal connections on Honeywell modulation controller.
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Figure 7. Terminal connections on back plate of heater panel.
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Figure 8. Terminal connections in burner junction box.
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