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b. Poor air/gas mixture (too much gas or not enough air) at burner...yellow or poor flame pattern...
1) Not enough make-up air.
2) Restriction in exhaust.
3) Gas pressure too high.
4) Impellor (blower/fan) "squirrel cage" rotating in the wrong direction.
5) Burner orifice size (D.M.S.) too large for application (i.e., high elevation).
c. Sail switch is fluttering...
1) Restriction in exhaust...
a) Lint drawer screen is dirty or is not being cleaned often enough.
d. Failed burner hi-limit switch...opens at incorrect temperature.
e. Gas supply may have low heating value.
8. Steam Models
a. Low steam supply...
1) Steam trap too small.
2) Supply line too small.
b. Low steam pressure.
c. Insufficient make-up air.
d. Lint drawer screen is dirty or is not being cleaned often enough.
e. Restriction in exhaust.
f. Dirty steam coil...
1) Fins clogged with lint.
g. Steam damper system not functioning properly...
1) Damper is sticking closed.
2) Leak in pneumatic (air) system.
9. Extractors (washers) not performing properly.
10. Failed lint chamber hi-heat switch (thermostat)...opens at incorrect temperature.