FloAire Indirect Fired Heater - Manual (Page 22)

22
Flame Rollout Condition Floating Flame Condition Lifting Flame Condition
Furnace Troubleshooting Chart
Problem Potential Cause Corrective Action
Pilot Does Not Light/Stay Lit Main gas if 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
Pilot orifice fitting leak 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
Main Burners Do 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 ignition controller Replace ignition controller
Not Enough Heat Unit cycling on high limit Increase airflow through furnace and
check gas pressure
Main gas pressure too low Increase main gas pressure – do not
exceed 14 in. w.c. inlet pressure
Too much airflow Decrease airflow if possible
Furnace 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
Lifting Flames or Flashback Too much primary air Reduce primary air
Manifold pressure set too high Reduce manifold pressure
Orifice too large Check orifice size
Yellow Tipping Insufficient primary air Increase primary air
Dirty orifice Check and clean orifice
Misaligned orifice Check manifold alignment
Floating Flames or Flame Rollout
Insufficient primary air Increase primary air
Orifice too large Check orifice size
Manifold pressure too high Decrease manifold pressure
Blocked vent Check venting system