Specifications

TroubleshootingGuide
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22|Page
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5.4TROUBLESHOOTING–PROCEDURES
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VerifyingproperDipswitchsettings p.22
Drainingtheunit  p.23
Cleaningthefilter  p.23
CheckingforaCrossConnection p.24
CheckforReverseConnection p.24
Checkgassupplypressure p.24
Purgethegaslineofair p.24
Adjustingmanifoldpressure p.25
ResettingtheComputerBoard p.26
CheckingtheOHCF  p.26
VERIFYINGPROPER
DIPSWITCHSETTINGS:
• IncorrectDipswitchsettingscancausea031
errorcode.
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Table4–LeftBankofDipswitches
No. Function ONposition OFFposition
1 Gastype Propane Disable
2 NaturalGas Disable
3 N/A N/A N/A
(Default)
4 Allowadjustmentsoffanmotorspeed
(Similarproceduretochangingmanifoldpressure)
Enable Disable
(Default)
5 FM+,FM++,FM+++
Fanmotorforcombustion
 No.5
OFFposition ONposition
No.6 OFFposition 0% +6%
ONposition +12% +18%
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Fanmotorforexhaust(Indoormodelsonly)
 No.5
OFFposition ONposition
No.6 OFFposition 0% +3.6%
ONposition +7.3% +11.4%
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6
7 INPUT‐(Maximumgasinputisreduced) ‐10%Max
Input
Disable
(Default)
8 Allowaccesstooperationhistory
(Specialpurposeonly)
EEPROMdata
transfer
Disable
(Default)
9 N/A N/A N/A
(Default)
10 Typeofwaterheatermodel Indoor Outdoor
Figure23