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EX08DT and EX11DT 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
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.
35
Overheat Temperature Thermistor 2
Short Circuit
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.
