Page 41
Yes
Gas manifold pressure Correct
Check the following
1-Does the unit have the correct air
orifice size? See table 25.
2 -Is the air 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
Troubleshooting is complete
Check Gas Manifold Pressure
Replace air orifice.
See table 3.
sure. Is the system operating
pressure within range correct ?
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.
Is system operating
pressure correct ?
Replace gas valve
No
Yes
Is ignition or resonance
issue resolved?
Yes
Troubleshooting is complete
No
No
No
Troubleshooting Poor Ignition and Combustion Resonance Issues
-05 and Later Models
No
Yes
Is the incoming voltage between
108V and 132V?
Is gas supply pressure
between 5” and 14”wc
Call a licensed electrician
or the electric comp.
Call a licensed plumber
or the gas comp.
No
No
For resonance issue, install Low
Profile Combustion Air Intake Kit
Catalog number 25B23
Yes
Yes
For ignition issue
replace air orifice.
See table 25.
FIGURE 26
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