Sterling TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-30 - Manual (Page 36)

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1. Incorrect manifold pressure or input.
1. Unit is over fi red.
2. Air fl ow is low.
3. Defective switch.
4. Defective control board.
1. Loose wiring or connections.
2. Motor overload is tripped or bad motor.
3. Bad control board.
1. Power venter improperly wired.
2. Motor overload cycling or defective motor.
3. Defective control board.
1. Power venter improperly wired.
2. Main burner did not light on call for heat.
3. Defective control board.
4. Loss of pressure. Pressure switch not
made.
R. Cold air is delivered during
heater operation.
S. High limit tripping.
T. Power venter will not run.
U. Power venter turns on and off
during operation.
V. Power venter will not stop.
1. Refer to “Operation”.
1. Burner orifi ce may be too large, verify
and replace.
2. Check for proper voltage, ensure fan
blade is correctly positioned 1/3 inside venturi.
3. Check operation of switch, did the switch
open when unit is running or is the switch
open during start-up.
4. Check for 24v on line side of the high limit.
Constant voltage should be recorded if not
control board is suspect. Check fl ash code.
1. Check all wring in the power vent circuit to
ensure good connection, including “Neutral”.
2. Check for 115v between motor leads and
check amp draw of motor. Replace if needed.
3. Check for continuous 115v on terminal
“CBM Blower” and neutral during call for
heat. If not present and all checks are
normal, replace.
1. Check power venter 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
“CMB Blower” during call for heat, replace
board if found defective.
1. Check power venter circuit per wiring
diagram.
2. Heater is in lockout mode check fl ash code
table for problem.
3. No fl ash codes present along with no call
for heat, replace control board.
4. Check venting for blockage. Check tubing for
blockage or hole. Check spud for blockage.
SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION
Table 9 - Tubular Propeller Troubleshooting Guide