Sterling GG-120 Manual De Usuario

36

  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.