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36 EX17DT and EX22DT Installation and Operation Manual
5.8 Diagnostic Codes
[1] The display of code 11 is dimly flashing.
[2] If the fusible link needs replacement, it must be done by a qualified service agency. In addition, the
cause of the overheat needs to be determined. The fusible link is a one use safety device that breaks
to shut off the furnace.
[3] Remove any obstructions. The flue needs to be kept clear to expel exhaust gases. If the furnace fails
to operate contact a qualified service agency.
CODE
DISPLAYED
FAULT REMEDY
11 [1]
No Ignition
Check that gas is turned ON.
Check that the vent termination is not blocked.
Refer to section “5.7 Restart Function.”
Service call if repeated.
14 Overheat
Clean filter.
Service call if repeated. [2]
16
Room Overheat
(More than 104°F/40°C)
Lower the room temperature.
30
Overheat Temperature Thermistor 2
Disconnection (open circuit)
31
Room Temperature Thermistor
Disconnection (Open Circuit)
32
Room Temperature Thermistor Short
Circuit
33
Overheat Thermistor 1 Disconnection
(Open Circuit)
34
Overheat Thermistor 1
Short Circuit
35
Overheat Temperature Thermistor 2
Short Circuit
40 Pressure Sensor Sensing Tube Failure
49 Pressure Sensor Breakdown
53 Abnormal Spark Sensed
61 Combustion Fan
62 Convection Fan
70 ON/OFF Switch or “Set back” Switch
71 Solenoid Valve Failure
72 Flame Rod Failure
73 Communication Error
99 Flue Block Check around the flue terminal for blockage. [3]
Service call.
If there is a malfunction the furnace may shut down as a safety precaution and display a fault code to assist
in diagnosing the problem. The fault code will flash in the display on the control panel. When making a
service call, this code will assist with diagnosing the fault.
You may be able to clear the fault code by turning the furnace off and then on again. If the fault code remains
or returns on the next operation, contact Rinnai or your nearest service agent and arrange for a service call.
Table 9: Diagnostic Codes
WARNING
Some of the checks below should be performed by a trained and qualified professional.
Consumers should never attempt any action that they are not qualified to perform.
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