Rheem RGFG Installation Instructions Manual page 81

TABLE 24 (CONTINUED)
FURNACE FAULT CODES EXPANDED W/DESCRIPTIONS AND SOLUTIONS – CONTINUED
CODE AT DUAL 7-SEGMENT DISPLAY OF IFC & FAULT AREA OF COMM. THERMOSTAT : 16
MESSAGES TO HOMEOWNER AT COMM. THERMOSTAT: "CALL FOR SERVICE " & "CHECK FURNACE".
MESSAGE IN FAULT AREA OF COMM. THERMOSTAT : "IGN FAIL"
STATUS: This is a critical fault. The furnace will not operate in any mode.
DESCRIPTION: This code is displayed anytime there is an igniter failure. It may also be displayed if the furnace control
relay for the igniter is not closing or cannot be sensed -inidicating a faulty control board. The fault may also be displayed
16
if there is improper grounding of the control board.
EXPECTED OPERATION: Heating operation will not be permitted.
CAUSE: The control cannot sense the igniter. The igniter may be out of spec, the control may be faulty or there may be
a large potential differnce between ground and neutral to the furnace control.
SOLUTION: Check the igniter and the connections between the igniter and the control board. If these are OK, check
ground potential between neutral and ground. There should be no more than 5 volts difference. If this is OK, check the
furnace control. Replace if necessary.
IGNiter FAIL
(TABLE CONTINUES ON FOLLOWING PAGES)
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