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