Special Note: Contact gas supplier to engineer gas unit demands and distribution systems
10. Blower motor starts and stops frequently (while main burner is on)
A. Improperly set fan & limit switch
Set switch to proper temperatures (90°/ 110°/ 170°)
B. Defective fan & limit switch
Replace
C. Furnace is not at full firing rate
See main burner section
11. Discharge air too hot / too cold
A. Check firing rate
Check gas pressures, orifice size
B. Improperly set fan & limit switch
Set switch to proper temperatures (90°/ 110°/ 170°)
C. Defective fan & limit
Replace
D. Blower belt slipping / blower speed is improper
Correct belt tension / check motor or blower pulley size
TROUBLESHOOTING
(continued)
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