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Troubleshooting: Heating Sequence of Operation (continued)
Page 68 of 74
CALL FOR HIGH FIRE WITH TWO-STAGE THERMOSTAT
2
1
2 Stage
Thermostat
1st Call
for High
Fire?
YES
NO
2nd Stage
Recognition Delay
(30 Seconds)
Combustion Air Inducer ON
(100% Rate Speed)
High
Pressure Switch
NO
Closes Within
10 Seconds?
YES
Adjust Indoor
Blower to
Appropiate speed
3A
Wait for Call for Heat Satisfied
System will always light at 70% even if 2nd stage call for heat is in place
1
If the high pressure switch does not close within 5 attempts, the system
2
will operate at low fire for the remainder of the call for heat at request
Increase Combustion
Error Code
Air Inducer Speed
Flashes
if Not at 100%
Rate Speed
Issue 2346
Wait 5
Minutes
508364-01
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