Rinnai Error Code 29: Condensate Neutralizer
Warning: Your Rinnai water heater is displaying error code 29, indicating a condensate neutralizer issue. This isn't an immediate safety risk, but it's important to address to prevent further damage.
How to Fix Rinnai Code 29
- Check if the condensate neutralizer is clogged. If it is, try cleaning it using a suitable cleaner and a small brush.
- If the neutralizer is clean and the error persists, it's likely a faulty sensor or incorrect wiring. In this case, it's best to call a professional.
- If you're unsure about any of these steps or if the error code returns, always call a professional HVAC technician.
How to Reset Rinnai Code 29
- Turn off the unit using the power button on the front panel.
- Turn off the gas supply valve.
- Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
- Restore power at the breaker, then open the gas valve.
- Turn the unit back on. If the error returns, the underlying issue needs repair.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Rinnai Error Code 29 Mean?
Error code 29 on your Rinnai water heater means the condensate neutralizer, which helps maintain a safe pH level in the condensate, isn't functioning properly. This could be due to a clogged neutralizer or a faulty sensor. Although this isn't an immediate safety hazard, it's crucial to address this issue to prevent potential damage to your water heater and ensure its longevity.
Common Causes
- Clogged condensate neutralizer
- Faulty pH sensor
- Incorrect water chemistry
- Neutralizer not installed or incorrectly wired
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The condensate neutralizer is clogged | Inspect the neutralizer for signs of mineral buildup or clogging | No visible buildup or clogging |
| The pH sensor is functioning | Measure the pH level of the condensate using a pH meter | pH level between 6 and 8 |
Applicable Rinnai Models
- CU(gas)
- HE(dual_fuel)
- HE++ Series(gas)
- I-SERIES(gas)
- NCB(gas)
- NPE(gas)
- RE(gas)
- REP(gas)
- RL(gas)
- RU(gas)
- RUCS(gas)
- RX(gas)
- RXP(gas)
- Rinnai NCB Series(gas)
- Rinnai NPE Series(gas)
- Rinnai R Series(gas)
- Rinnai RL Series(natural_gas)
- Rinnai RU Series(natural_gas)
- Rinnai RUR Series(gas)
- Rinnai VSP(gas)
- V(gas)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Condensate Neutralizer | RIN-0100900000 | — | Find Part |
| pH Sensor | RIN-0100900001 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Rinnai model families as 29.
| Code | Description | Severity |
|---|---|---|
| 02 | Stagnant Water Detection | Warning |
| 10 | Air Supply/Exhaust Blockage | Warning |
| 11 | No Ignition | Warning |
| 12 | Flame Failure | Warning |
| 14 | Thermal Fuse | Warning |
| 16 | Over-Temperature | Warning |
| 19 | Electrical Grounding | Warning |
| 25 | Condensate Overflow | Warning |
| 31 | Inlet Thermistor Failure | Warning |
| 32 | Outlet Thermistor Failure | Warning |