Diagnostic Codes Remedies - Rinnai EX38CT RHFE-1005FTA2 Installation And Operation Manual

Diagnostic Codes and Remedies
If there is a malfunction the appliance 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
CODE DISPLAYED
11 [3]
14
16
30
31
32
33
34
35
49
53
61
62
70
71
72
73
81
99
[1] 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
appliance.
[2] Remove any obstructions. The flue needs to be kept clear to expel exhaust gases. If the appliance fails to
operate contact a qualified service agency.
[3] Only this code is dimly lit.
Some of the checks below should be done by a licensed professional. Consumers should
never attempt any action that they are not qualified to perform.
FAULT
No Ignition
Overheat
Room Overheat
Overheat Temperature Thermistor 2
Disconnection (open circuit)
Room Temperature Thermistor
Disconnection (Open Circuit)
Room Temperature Thermistor
Short Circuit
Overheat Thermistor 1
Disconnection (Open Circuit)
Overheat Thermistor 1
Short Circuit
Overheat Temperature Thermistor 2
Short Circuit
Sensor Breakdown
Sparker
Combustion Fan
Convection Fan
ON/OFF Switch or "Set Back" Switch
Solenoids
Flame Rod
Communication Error
Solenoid Valve
Flue Block
Rinnai Corporation EX38CT Manual
REMEDY
Check that gas is turned ON.
Check that the vent termination is not blocked.
Refer to the Restart Function explanation.
Service call if repeated.
Clean filter.
Service call if repeated. [1]
Lower room temperature to less than 104°F (40°C).
Service call.
Turn furnace OFF, then ON again.
Service Call
Check around the flue terminal for blockage. [2]
33