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Service &
Troubleshooting
Guide - Home Generator
Systems
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Sf_an
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Model 1938 (I OkW) Troubleshooting
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• Replace the 15 Amp fuse.
• Close the generator
circuit breaker.
• Set AUTO/OFF/MANUAL
switch to AUTO.
• Remove utility power and verify system operation.
• Re-install all enclosure panels and return system to
Automatic
standby configuration.
• Measure for short-to-ground
on Wire #85.
• • If a short is detected:
• Repair and/or replace wiring, as necessary.
• . If no short is detected:
• Remove oil pressure switch and install oil pressure
gauge.
• Re-install connector
at CMA board.
• Re-install
15 Amp fuse.
• Turn utility ON.
• At the AUTO/OFF/MANUAL
switch, select
MANUAL.
The engine should start and run.
NOTE:
Oil Pressure @ 70 ° F (21 ° C):
10 - 50 PSI
(0.7 - 3.5 Bar)
• . If oil pressure is low:
Refer to engine service manual for repair procedures.
• • If problem persists:
• Replace oil pressure switch.
• • If oil pressure is normal:
Verify
Ground
connection
on CMA
circuit
board.
(See Figure
27)
Verify
that there
are no other
faults
BEFORE
replacing
the CMA
circuit
board.
• Replace CMA.
Low Voltage:
(Three
Blinks [ • • • ])
The Low Voltage shutdown
is designed to protect
the
generator
and its loads from an output voltage that is too
low. When utility power fails, the engine on the Home
Generator
System has started and the transfer switch has
transferred
the loads to the generator,
the CMA senses
output voltage at Pins #16 and #17 on wires TI and T2
(Refer to the schematic on pages 56-57). If the CMA does
not sense generator
voltage, it will shut down the generator
and the Diagnostic
LED will blink in a set of three.
This condition
may be caused by:
- A restriction
in the fuel flow
- A broken or disconnected
signal lead
- A failed alternator
winding
- An open control
panel circuit breaker
- An open in the neutral circuit.
Low Voltage
Troubleshooting
Procedure:
Gain access to the generator
unit by removing the air intake
and control panel doors and remove the cover to the back
of the CMA board (See Page 15, Figure 8).
• Reset the fault indication LED by selecting OFF at the
AUTO/OFF/MANUAL
switch for 30+ seconds.
Ensure that the generator
circuit breaker is in the
CLOSED
position and the 15 Amp fuse is installed and
functional.
• Perform a manual start.
When the unit has stabilized, check the generator
output:
• Measure the voltage at the input and output screws on
the back of the circuit breaker (Figure 18).
23
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