Sterling TC - Manual (Page 28)

28
Table 9 - Tubular Blower Troubleshooting Guide (continued)
SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION
S. Power ventor will not run. 1. No power supply to unit.
2. Thermostat not calling.
3. Loose wiring or connection.
4. Motor overload protection is tripping or bad
motor.
5. Defective control board.
1. Turn on power supply, check fuses and
replace if bad.
2. Turn up thermostat. Check for 24V on
terminals R and W1 on terminal strip.
3. Check all wiring in the power vent circuit to
ensure good connection, including "Neutral."
4. Check for 115V between motor leads
and check amp draw of motor. Replace if
necessary.
5. Check for continuous 115V on terminal
"CBM" Blower" and neutral during call for
heat. If not present and all checks are normal,
replace.
T. Power ventor turns on and off
during operation.
1. Power ventor improperly wired.
2. Motor overload cycling or defective motor.
3. Defective control board.
1. Check power ventor circuit per wiring
diagram.
2. Check motor voltage and amp draw to motor
name plate, replace if motor found defective.
3. Check for continuous 115V on terminal
"CBM" Blower" and neutral during call for
heat. If not present and all checks are normal,
replace.
U. Power ventor will not stop. 1. Power ventor improperly wired.
2. Main burner did not light on call for heat.
3. Defective control board.
1. Check power ventor circuit per wiring
diagram.
2. Heater is in lockout mode; check fl ash code
table for problem.
3. If no fl ash codes present along with no call for
heat, replace control board.
V. Noisy power ventor. 1. Power ventor wheel loose.
2. Power ventor wheel is dirty.
3. Power ventor wheel is rubbing on housing.
1. Replace or tighten.
2. Clean power ventor wheel.
3. Realign power ventor wheel.