Rinnai Error Code 14: Overheat (fusible link) (Wall Furnace)

Updated October 13, 2026 · by Aurora Star Tech Inc.

Rinnai error code 14 on a wall furnace means: Overheat (fusible link). It is also called Rinnai diagnostic code 14.

Critical severityWall FurnaceEX DT

Homeowner? What Rinnai code 14 means for you

Stop and call Your wall furnace is reporting: Overheat (fusible link). This code is a safety shutdown. Turn the wall furnace off and call a licensed technician. Do not keep resetting it. If you smell gas, leave the house and call your gas utility or 911 from outside.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Rinnai error code 14 mean?

The overheat safety tripped. The fusible link is a one-time safety device that breaks to shut the furnace off when it overheats.

Applies to: Rinnai EnergySaver direct vent wall furnaces EX08DT, EX11DT, EX17DT, EX22DT

Common causes of Rinnai code 14

Dirty air filter restricting airflow
Underlying overheating condition that must be found

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Rinnai models that use code 14

EX08DT EX11DT EX17DT EX22DT EX22DT-W

Other Rinnai Wall Furnace codes

Code	Meaning
11	No ignition
16	Room overheat (above 104°F / 40°C)
30	Overheat temperature thermistor 2 open circuit
31	Room temperature thermistor open circuit
32	Room temperature thermistor short circuit
33	Overheat thermistor 1 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 fault

All Rinnai Wall Furnace error codes →

Rinnai code 14: homeowner questions

What does Rinnai code 14 mean?

Overheat (fusible link). The overheat safety tripped. The fusible link is a one-time safety device that breaks to shut the furnace off when it overheats.

Is it safe to keep using my wall furnace with code 14?

No. Code 14 is a safety shutdown, so keep the wall furnace off until a licensed technician has checked it.

Can I reset Rinnai code 14 myself?

Do not keep resetting it. Repeated resets can hide a safety problem; a licensed technician needs to find the cause.

Who can fix Rinnai code 14 near me?

Aurora Star Tech Inc. repairs Rinnai wall furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: Furnace Not Turning On: What to Check

Source: Rinnai EX08DT/EX11DT and EX17DT/EX22DT Installation and Operation Manuals (200000083, 200000084), Table 9 'Diagnostic Codes', p.35–36. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.