Diagnostic Codes - Rinnai EX1 7 DT Installation And Operation Manual

5.8 Diagnostic Codes

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.
WARNING
Table 9: Diagnostic Codes
CODE
DISPLAYED
11 [1]
14
16
(More than 104°F/40°C)
Overheat Temperature Thermistor 2
30
Disconnection (open circuit)
Room Temperature Thermistor
31
Disconnection (Open Circuit)
Room Temperature Thermistor Short
32
Overheat Thermistor 1 Disconnection
33
Overheat Thermistor 1
34
Overheat Temperature Thermistor 2
35
40 Pressure Sensor Sensing Tube Failure
49 Pressure Sensor Breakdown
53 Abnormal Spark Sensed
61
62
70 ON/OFF Switch or "Set back" Switch
71 Solenoid Valve Failure
72
73
99
[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.
36
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.
FAULT
No Ignition
Overheat
Room Overheat
Circuit
(Open Circuit)
Short Circuit
Short Circuit
Combustion Fan
Convection Fan
Flame Rod Failure
Communication Error
Flue Block
EX17DT and EX22DT Installation and Operation Manual
REMEDY
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.
Clean filter.
Service call if repeated. [2]
Lower the room temperature.
Service call.
Check around the flue terminal for blockage. [3]