Rinnai Error Code 79: Water leakage detected (Tankless)
Rinnai error code 79 on a tankless water heater means: Water leakage detected. It is also called Rinnai diagnostic code 79.
Homeowner? What Rinnai code 79 means for you
Call a technician Your tankless water heater is reporting: Water leakage detected. The tankless water heater has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Safe things you can check yourself
- Check that gas reaches the house: other gas appliances work, or the propane tank is not empty.
- Make sure the heater is plugged in and its breaker is on. In winter, keep the power on: it protects the unit from freezing.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the hot and cold water valves under the heater are fully open.
- If you have a remote controller, turn it off and on once. If the code comes back, call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Rinnai error code 79 mean?
The internal leak detector has sensed water inside the cabinet, or the leak sensor/its wiring is faulty.
Applies to: Non-SENSEI Series
Common causes of Rinnai code 79
- Leaking heat exchanger or internal piping
- Water pooled on the cabinet bottom pan
- Wet leak sensor
A technician checks these and 2 other possible causes on site before replacing any part.
Rinnai models that use code 79
Show all 59 models
C199eC199iR50LSiR63LSe2R75LSeR75LSiR94LSeR94LSiR98LSeR98LSe-ASMER98LSiR98LSi-ASMERC80eRC80iRC98eRC98iRE140eRE140iRE160eRE160iRE180eRE180iRE199eRE199iREP160eREP160iREP199eREP199iRH180RL75eRL75e(A)RL75iRL75i(A)RL94eRL94iRLX94iRU80eRU80iRU90eRU98eRU98iRUC80iRUC90iRUC98iRUCS65iRUCS75iRUR98eRUR98iRUS65eRUS75eV53DeV53eV65eV65iV75eV75iV94eV94iV94Xi
Other Rinnai Tankless codes
All Rinnai Tankless Water Heater error codes →
Rinnai code 79: homeowner questions
What does Rinnai code 79 mean?
Water leakage detected. The internal leak detector has sensed water inside the cabinet, or the leak sensor/its wiring is faulty.
Is it safe to keep using my tankless water heater with code 79?
It depends on the cause. The tankless water heater has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.
Can I reset Rinnai code 79 myself?
You can try one reset (power off for 30 seconds, then on). If Rinnai code 79 comes back, the cause is still there and a licensed technician should check it.
Who can fix Rinnai code 79 near me?
Aurora Star Tech Inc. repairs Rinnai tankless water heaters in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Tankless Water Heater No Hot Water: What to Check
Troubleshooting guides
- No hot water All brands · Tankless Water Heater
- Water temperature fluctuates All brands · Tankless Water Heater
Source: Rinnai Troubleshooting TWH Diagnostic Codes (100000652), p.62. 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.