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Gas manifold pressure within
range?
Check the following
1-Does the unit have the correct
air orifice size?
2 -Is the orifice fully seated tight
against the elbow ?
3
way?
4 - Is the air inlet screen clear of
any obstruction ?
Correct any problems found.
Is ignition or resonance issue
resolved ?
Check Air Orifice
See Figure 20
Troubleshooting is complete
Check Gas Manifold Pressure
Replace air orifice.
Check signal Pressure
Signal pressure
within range ?
Replace gas valve
Check the following
1-. Vent /air intake pipe restriction.
2- Plugged air inlet screen
3 - Signal hoses to gas valve
for kinks, loose fit or plugging.
Correct any problems found.
Manifold pressure correct ?
Replace gas valve
No
Yes
Is ignition or resonance
issue resolved?
Yes
Troubleshooting is complete
No
Replace air orifice.
No
No
Yes
Troubleshooting Poor Ignition or Combustion Resonance Issues
-01 to -04 models
No
Has the unit inducer RPM been reduced
to 4300 RPM? Does not apply to -040
unit
Yes
Contact your Service
Representative for assistance
Yes
Yes
No
FIGURE 22
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