FloAire FAV-M - Manual (Page 31)

31
Burner Troubleshooting Chart
Problem Potential Cause Corrective Action
Pilot does not light/stay lit Main gas is off Open main gas valve.
Air in gas line Purge gas line.
Dirt in pilot orifice Clean orifice with compressed air.
Gas pressure out of range Adjust to proper gas pressure.
Pilot valve is off Turn pilot valve on.
Leaking pilot orifice fitting Tighten pilot orifice.
Excessive drafts Re-direct draft away from unit.
Safety device has cut power Check limits and airflow switch.
Dirty flame sensor Clean flame sensor.
Remote panel in “Vent” mode Change to “Heat” mode.
No spark at igniter Check wiring, sensor, and ignition
controller. Check spark gap as shown
below.
Main burner does not light
(Pilot is lit) Defective valve Replace combination valve.
Loose valve wiring Check wiring to valve.
Defective pilot sensor Replace pilot sensor.
Shut-off valve closed Open shut off valve.
Defective flame safety controller Replace flame safety controller.
Pilot fails as main gas valves open
and main gas begins to flow Plug the first burner port next to the
pilot gas tube with burner cement.
Not enough heat Main gas pressure too low Increase main gas pressure – do not
exceed 14 in. w.c. inlet pressure (5 psi.
on size 4-5 heater).
Too much airflow Decrease airflow if possible.
Burner undersized Check design conditions.
Gas controls not wired properly Check wiring.
Thermostat setting too low Increase thermostat setting.
Thermostat malfunction Check/replace thermostat.
Unit locked into low fire Check wiring.
Too much heat Defective modulating gas valve Check/replace modulating valve.
Thermostat setting too high Decrease thermostat setting.
Unit locked into high fire Check wiring.
Thermostat wired incorrectly Check thermostat wiring.
Proper Spark Gap