Generac 6551 Portable Generator User Manual


 
Automatic Standby Generator Owner’s Manual 29
Section 5 Troubleshooting
Problem Cause Correction
The engine will not crank. 1. Fuse blown. 1. Correct short circuit condition by
replacing 7.5 Amp fuse in generator
control panel.
2. Loose, corroded or defective 2. Tighten, clean or replace
battery cables. as necessary.*
3. Defective starter contact. 3. *See #2.
4. Defective starter motor. 4. *See #2.
5. Dead Battery. 5. Charge or replace battery.
The engine cranks but 1. Out of fuel. 1. Replenish fuel/Turn on fuel valve.
will not start. 2. Defective fuel solenoid (FS). 2. *
3. Defective spark plug(s). 3. Clean, re-gap or replace plug(s).
4. Valve lash out of adjustment. 4. Reset valve lash.
The engine starts hard 1. Air cleaner plugged 1. Check/replace air cleaner.
and runs rough. or damaged.
2. Defective spark plug(s). 2. Clean, re-gap or replace plug(s).
3. Fuel pressure incorrect. 3. Confirm fuel pressure to regulator
is 10-12” water column (19-22 mm
mercury) for LP, and 3.5-7” water
column (7-13 mm mercury) for
natural gas.
4. Fuel selector in wrong position. 4. Move selector to correct position.
The generator is set to OFF, 1. Controller wired incorrectly. 1. Repair wiring or replace controller*
but the engine continues to 2. Defective control board 2. Replace controller.
run.
There is no AC output from 1. Main line circuit breaker is in 1. Reset circuit breaker
the generator. the OFF (or OPEN) position. to ON (or CLOSED).
2. Generator internal failure. 2. *
There is no transfer to 1. Main line circuit breaker is in the OFF 1. Reset circuit breaker to ON
standby after utility (or OPEN) position. (or CLOSED) position.
source failure. 3. Defective transfer switch coil. 3. *
4. Defective transfer relay 4. *
5. Transfer relay circuit open. 5. *
5. Defective control logic board. 5. *
Unit consumes large 1. Engine over filled with oil. 1. Adjust oil to proper level.
amounts of oil. 2. Engine breather defective. 2. *
3. Improper type or viscosity of oil. 3. See “Engine Oil
Recommendations”.
4. Damaged gasket, seal or hose. 4. Check for oil leaks.
*Contact an Authorized Service Dealer for assistance.