HVACopediaRinnai · Wall furnace
FILTER Filter lamp flashing red (air filter blocked)
What the display is showing
The filter lamp flashes red and the furnace beeps 5 times, repeating every 5 minutes, when the air filter is blocked. This is a warning; if left, the furnace eventually shuts off and shows fault code 14. Clean the filter with the furnace off and cool. The filter indicator keeps working in remote thermostat mode.
Applies to: Rinnai EX08DT, EX11DT, EX17DT, EX22DT direct vent wall furnaces
Settings for these units
Clearances to combustibles and service · EX DT
| Location | Clearance |
|---|---|
| Top | 0 in. (0 mm) |
| Bottom / ground | 0 in. (0 mm) |
| Front (panel) | 40 in. (1 m) - flooring or carpet under 1.2 in. (30 mm) high not included |
| Back (including back spacer) | 0 in. (0 mm) |
| Sides (left and right) | 2 in. (50 mm) |
| Service access | 10 in. (254 mm) sides; 40 in. (1 m) front; area above per figure |
| Exhaust extension pipe | 1 in. (25.4 mm) to combustibles; 0 in. to non-combustibles |
Rinnai recommends 10 in. (254 mm) at top and both sides for servicing.
Service clearance figure above the unit: 10 in. (254 mm) on EX08DT/EX11DT, 9 in. (229 mm) on EX17DT/EX22DT.
Models that show this code
5 models in EX DT
Other codes on the same units
- 73 Communication error
- 99 Flue blocked
- A1-A8 / L1-L8 Gas code selection (gas type, altitude, vent length)
- Economy Economy indicator lit
- H Set temperature H (maximum burner output)
- L Set temperature L (minimum burner output)
- Lock Control panel lock indicator
- ON lamp green ON indicator green (powered, burner not lit)
Save it for the next call
Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.
Source: Rinnai EX08DT/EX11DT Installation and Operation Manual (200000083) and EX17DT/EX22DT (200000084), Filters p.37. Summarized in our own words; check the original manual for your model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.