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GAS MODELS ...
1) Low and/or inconsistent gas pressure.
Natural Gas pressure - must be between 3.5 and 4.0 inches of water column (W.C.).
L.P. (liquid propane) Gas pressure - must be between 10.5 and 11.0 inches of water column (W.C.).
2) Poor air/gas mixture at burner (too much gas or not enough air) at the burner...yellow or poor flame
pattern ...
a. Not enough make-up air.
b. Restriction in the exhaust.
2) Poor air/gas mixture at burner (too much gas or not enough air) at the burner...yellow or poor flame
pattern ...
c. Gas pressure too high.
d. Impellor (fan/blower) is rotating in the wrong direction only (for 3ø Models ONLY).
e. Burner orifice size (D.M.S. [drill material size]) too large for application (i.e., high elevation).
3) Sail switch is fluttering ...
a) Restriction in the exhaust ...
(1) Lint screen is dirty or is not being cleaned often enough.
4) Failed burner hi-limit...opens at incorrect temperature.
5) Gas supply may have too low a heating value.
ELECTRIC MODELS ...
1) No enough make-up air.
2) Restriction in the exhaust ...
3) Lint screen is dirty or is not being cleaned often enough.
4) Impellor (fan/blower) is rotating in the wrong direction only (for 3ø Models ONLY).
5) Failed electric element(s).
6) Sail switch is fluttering ...
a) Restriction in the exhaust.
b) Sail switch is not adjusted properly.