The Printed Circuit Board (PCB) is a generator-set controller. It is used on generator sets from Generac, including the GPS 17500.
Also fitted to: Generac GPS 12500 (004451, 004986), Generac GPS 15000 (004582, 004987, 005209).
| Symptom | Remedy |
|---|---|
| 10 Amp Fuse (F1) Blowing | INSTALL NEW 10 AMP FUSE TEST 43 - CHECK START STOP RELAY (SSR) CHECK FUEL SOLENOID (TEST 47) AND STARTER CONTACTOR RELAY (TEST 44) VERIFY BCR1 AND BCR2 ARE WIRED CORRECTLY TEST 19 - CHECK BATTERY CHARGE RECTIFIER 2 (BCR2) TEST 45 - CHECK WIRE 15 BAD TEST 49 - CHECK WIRE 15B TEST 46 - CHECK WIRE 14 CIRCUIT |
| Engine Cranks But Will Not Start | TEST 5 - CHECK STEPPER MOTOR CONTROL TEST 32 - CHECK START STOP RELAY (SSR) TEST 36 - CHECK FUEL SHUTOFF SOLENOID (FSS) TEST 31 - REMOVE WIRE 18 / SHUTDOWN LEAD TEST 37 - CHECK FUEL SHUTOFF SOLENOID VOLTAGE DC VOLTAGE MEASURED AT TWO PIN CONNECTOR |
| Engine Starts Hard and Runs Rough | ADJUST VALVES AND RETEST TEST 5 - CHECK STEPPER MOTOR CONTROL REPLACE SWITCH CHECK ENGINE OIL LEVEL TEST 42 - CHECK OIL PRESSURE SWITCH AND WIRE 86 TEST 27 - TEST START-RUN-STOP SWITCH (SW1) REPLACE SWITCH REPLENISH OIL VERIFY START STOP RELAY (SSR) IS WIRED PROPERLY |
| Engine Starts Then Shuts Down | TEST 50 - CHECK WIRE 167 REPLACE BAD REPLACE BAD CORRECT WIRING BAD REPLACE BAD REPAIR OR REPLACE WIRE 14 REPAIR OR REPLACE WIRE 14 REPLACE BAD GOOD |
| Engine “Hunts” / Erratic Idle | REPLACE PRINTED CIRCUIT BOARD NO SURGING STILL SURGING TEST 5 - CHECK STEPPER MOTOR OPERATION TEST 39 - CHECK CARBURETION GOOD |
| Idle Control “RPM Does Not Decrease” | REPLACE PRINTED CIRCUIT BOARD VERIFY THAT THERE IS NO LOAD ON THE GENERATOR GOOD TEST 53 - CHECK IDLE CONTROL WIRING BAD TEST 54 - CHECK IDLE CONTROL TRANSFORMERS (ICT) REPLACE BAD REPAIR OR REPLACE |
| Idle Control “RPM Does Not Increase When Load Is Applied” | REPLACE PRINTED CIRCUIT BOARD VERIFY THAT WIRE 11 & WIRE 44 ARE ROUTED THROUGH IDLE CONTROL TRANSFORMERS (ICT) ROUTE THROUGH IDLE CONTROL TRANSFORMERS AND RE-TEST GOOD TEST 55 - CHECK TR1 & TR2 WIRING BAD ADJUST OR REPLACE BAD REPLACE REPAIR OR REPLACE GOOD BAD - ENGINE MISS APPARENT GOOD |
| Low Oil Pressure (LOP) closes Wire 86 will be connected to Wire 0 frame ground. | Printed Circuit Board action will open Wire 229 from ground; this action will de-energize the Start-Stop Relay (SSR). This action will cause a shutdown. |
| Unit Overspeeds | REPLACE CIRCUIT BOARD NO VOLTAGE TEST 5 - CHECK STEPPER MOTOR OPERATION REPAIR OR REPLACE GOOD BAD TEST 52 - CHECK IDLE CONTROL SWITCH REPLACE BAD |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.