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Rinnai gas heater code 14: Filter blocked or overheat

Gas heater, Australia

The fan filter is blocked or the heater has overheated, so it stopped.

You can often clear this yourself. Work through the causes below in order, most likely first.

What causes it

  1. The fan filter at the back of the heater is clogged with dust or lint.

    Clean the Energysaver fan filterYou can do this

    1. Turn the heater off and wait until the fan has stopped and the heater is cool, then unplug it.
      Do not unplug the heater while the fan is still running.
    2. Pull the fan filter straight up and out of the back of the heater. The 1005FT has two filters.
    3. Vacuum or dust a dry filter. If it is oily, wash it in mild detergent, drain it and let it dry fully.
    4. Refit the filter, plug the heater in and turn it on.
      Never run the heater without the filter in place, and do not keep using it with the filter indicator flashing.
    5. Clean the filter weekly during the heating season to stop this code returning.

  2. If the code returns with a clean filter, the heater needs a service call.

    Book a licensed gasfitter

How to read this code on your unit

Booking a licensed gasfitter

Book a licensed gasfitterlicensed gasfitter

  1. Turn the unit off and leave the covers on. Gas components must only be serviced by a licensed technician.
  2. Note the code, how often it appears, and the model and serial numbers from the rating label.
  3. Book a licensed gasfitter and give them those details.

Models that show this code

6 models in 2 ranges
RangeModels
Energysaver FDT commercial flued gas heaterRHFE-559FTSN (Energysaver 559FDT), RHFE-1005FTSN (Energysaver 1005FDT)
Energysaver FT flued gas heaterRHFE-309FT3 (Energysaver 309FT), RHFE-559FT3 (Energysaver 559FT), RHFE-561FT3 (Energysaver 561FT), RHFE-1005FT3 (Energysaver 1005FT)

Where this comes from

Checked against the manufacturer's manual on 9 October 2026.

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Other Rinnai gas heater codes

Code Meaning What you can do
11 Ignition failure Safe checks first, then a pro
12 Flame failure Safe checks first, then a pro
16 Room overheat You can often fix it
30 Overheat temperature sensor fault Safe checks first, then a pro
31 Room temperature sensor fault Safe checks first, then a pro
32 Room temperature sensor fault Safe checks first, then a pro
33 Overheat temperature sensor fault Safe checks first, then a pro
34 Overheat temperature sensor fault Safe checks first, then a pro
35 Overheat temperature sensor fault Safe checks first, then a pro
40 Sensor tube failure Call a pro
49 Sensor breakdown Safe checks first, then a pro
53 Spark sensor fault Call a pro