Richmond Error Code 16: Outlet Temp Sensor
How to Fix Richmond Code 16
- Step 1: Turn the water heater off and then back on again. This might reset the system and clear a temporary error.
- Step 2: Check the water heater's vent for any obstructions. Make sure nothing is blocking the intake or exhaust.
- Step 3: If the error persists after resetting, contact a qualified HVAC technician to diagnose and repair the issue.
How to Reset Richmond Code 16
- 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 Richmond Error Code 16 Mean?
Error code 16 on your Richmond tankless water heater indicates a problem with the outlet temperature sensor. This sensor monitors the temperature of the water as it leaves the unit. The control board uses this information to regulate the burner and maintain the desired water temperature. If the sensor is faulty, sending incorrect readings, or if the wiring is damaged, the control board will display this error and shut down the unit as a safety measure. This prevents the water from overheating or the unit from operating inefficiently. Basically, the unit doesn't know how hot the water is, so it stops running to be safe. This error can also sometimes appear if the unit itself is overheating for other reasons, even if the sensor is still good. A technician will need to diagnose the root cause to get your hot water back.
Common Causes
- Faulty outlet temperature sensor
- Loose or corroded wiring connections to the outlet temperature sensor
- Damage to the sensor wiring harness
- Scale buildup on the sensor, causing inaccurate readings
- Overheating due to poor water flow or other system issues
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Error code 16 is displayed | Measure the resistance of the outlet temperature sensor at the control board connector. Refer to the service manual for the correct pins. | Resistance should match the temperature/resistance chart in the service manual. Typically around 10-12k ohms at room temperature. |
| Sensor resistance is outside the expected range | Inspect the wiring harness and connections to the sensor for damage, corrosion, or loose connections. | Wiring and connections should be clean and secure. |
| Wiring and sensor appear OK | Check the voltage to the sensor from the control board. | Typically 5VDC. Refer to the wiring diagram. |
| Voltage is good, wiring is good, but resistance is still bad | Replace the outlet temperature sensor. | New sensor should read within the correct resistance range. |
Applicable Richmond Models
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Outlet Temperature Sensor | — | — | — |
| Wiring Harness | — | — | — |
| Control Board | — | — | — |
Related Codes on Same Models
Other codes that affect the same Richmond model families as 16.
| Code | Description | Severity |
|---|---|---|
| 11 | No Ignition | Critical |
| 12 | Flame Failure | Critical |
| 14 | Overheat | Warning |
| E1 | Sensor Fault | Warning |
| E2 | Dry Fire | Critical |
| E3 | Overheat Protection | Warning |
| E4 | High Temp Cutoff | Critical |
| E5 | Element Fault | Warning |