Rheem 96MDV Series, Installation Instructions Manual

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TABLE 20 (continued)
R96V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS
10
ONE-HOUR LOCKOUT
(5) Check the manifold pressure during ignition. For natural gas it should be approx. 3.5" wc and for LP gas it should be approx.
10" wc. If manifold pressure is good, watch the burner during ignition. If the first burner lights, but the second, third and so on
do not light, the burner may need to be replaced.
STATUS: This is a critical fault. The furnace will not operate in gas heat modes but all other modes (e.g. cooling) should
function.
DESCRIPTION: This fault is displayed under the following conditions:
2. after declaring a Water Sensed condition (heating operation is shut down due to this fault) several times consecutively. When
the control enters lockout the fault codes “ 59 ” (Water Sensed) and “ 10 ” (soft lockout) will be displayed alternately at the seven-
segment display. See fault code 59 for a description on expected operation, causes and solutions for this fault code.
SOLUTION: The solution will depend on the cause. Solutions to noted causes (1) through (5) above are:
(2) Turn the valve on.
(4) Replace the furnace control.
(3) Replace or reposition the igniter or check all connections and wire between the igniter and the furnace control (or I.F.C.).
(3) The igniter is not working properly. It may not be properly connected or the spark location may not be correct.
(1) The flame sense rod is unable to sense flame. It may need cleaning or may not be properly connected.
(2) The gas valve may be turned off.
1. When a failed ignition has occurred four times in a row, the control enters one-hour lockout and fault codes “ 10 ” and “ 11 ” will
be displayed alternately at the seven-segment display. See fault code 11 for a description on expected operation, causes and
solutions for this fault code.
11
FAILED IGNITION
STATUS: Up to three failed ignitions will not constitute a critical condition. Critical condition (with no heating operation) is only
noted when the furnace has failed to ignite four or more times consecutively. After four failed ignition attempts, the IFC enters
one-hour lockout and the dual faults "
11 " and "10" are alternately displayed at the IFC's seven-segment display.
DESCRIPTION: This fault is displayed at the furnace control after the first failed ignition attempt. It continues to be displayed
until successful ignition or the furnace control has failed to ignite four consecutive times. After four attempts, the status of the
fault is elevated to "10" and the furnace control (or I.F.C.) reacts as described under description for the fault code "10".
Note: This fault will not be displayed to the homeowner on communicating systems unless it occurs at least three times within a
single heat call. It will not be displayed to the homeowner after the first or even second failure. However, it will be displayed in
the active fault screen of thermostat immediately after the first failure (and all subsequent failures) during a single heat call.
Further, this fault (11) will only be logged into the fault buffer one time. It will not log more than once in the buffer.
(4) The furnace control may not be working properly and may need to be replaced.
CAUSE: There can be several causes for a failed ignition attempt(s). The most common are:
EXPECTED OPERATION: After the first failed ignition attempt, the fault (" 11 ") is displayed and the inducer will complete a 20
second post-purge followed by a second ignition attempt. This cycle will be repeated until gas heat is established or until the
fourth failed ignition attempt. After the fourth failed attempt, the furnace control (IFC) will proceed to one-hour lockout.
(5) The flame may not be properly spreading from the first burner to the last.
(1) Clean or replace the flame sense rod or check all connections and wire between the rod and the furnace control (or I.F.C.).
Make sure furnace ground is properly connected.
3. While the control has entered a one-hour lockout after declaring a dead blower after the main limit control has been open for
more than 150 seconds, the fault codes “ 61 ” (Non-operational blower) and “ 10 ” (soft lockout) will be displayed alternately at the
seven-segment display. Note: the dead blower fault and associated one-hour lockout will occur up to four times in one heat call.
Upon declaring this fault for the fourth time in one heat call, the control will enter hard lockout requiring manual reset of power to
the furnace. See fault code
61 for a description on expected operation, causes and solutions for this fault code.
4. When IFC is in soft lockout and fault “93” is active, the fault code “ 93 ” is to be displayed alternately with the fault code “ 10 ” at
the furnace seven-segment display. See fault code 93 for a description on expected operation, causes and solutions for this
fault code.
6. While the control is in one-hour lockout due to an unexpected flame, the fault codes “ 14 ” (unexpected flame) and “ 10 ” (soft
lockout) will be displayed alternately at the furnace seven-segment display. See fault code 14 for a description on expected
operation, causes and solutions for this fault code.
5. When flame is lost five times in a row, the control enters one-hour lockout and fault codes “ 10 ” and “ 13 ” will be displayed
alternately at the IFC seven-segment display. See fault code 13 for a description on expected operation, causes and solutions
for this fault code.
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