37
SECTION VIII
SERVICE DIAGNOSIS
MALFUNCTION POSSIBLE CAUSE REMEDY
Motor will not run 1. Blown branch circuit fuse. 1. Renew fuse(s).
2. Blown line disconnect fuse 2. Renew fuse(s) or reset
or tripped circuit breaker. circuit breaker.
3. Blown control circuit fuse(s). 3. Renew control circuit
fuse(s).
4. Magnetic starter overload 4. Reset overload relay(s).
relay tripped.
5. Loose or broken wires. 5. Check and repair or replace
(Motor or control) broken wire(s) and
connection(s).
6. Defective or damaged 6. Check components. Renew
control circuit components. as required.
(Relays, temperature
switches, etc.)
7. Damaged motor. 7. Repair or replace motor.
Air end will not rotate. 1. Defective or damaged air 1. Replace air end.
end.
Motor will not rotate. 1. Defective or damaged motor. 1. Replace or repair motor.
Air end/motor will not 1. Low line voltage or 1. Have qualified electrician
come up to full speed inadequate power check and correct power
before starter overload supply. supply.
trips.
2. Starting against pressure. 2. Check and correct cause of
Unit receiver not blown unit receiver not blowing
down. down. (Blow down valve:
controls).
Compressor fails to 1. Clogged or restricted air 1. Clean or renew air filter
provide sufficient air filter element. element.
for demands.
2. Excessive distribution 2. Correct air leaks as required.
system leakage.
3. Air demand exceeds 3. Reduce air demand. Install
compressor capacity. additional compressors.
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