Reliance
Reliance Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
Advertisements
E0
Digital Reliance water heater display shows E0 and unit will not heat water
Control Board Communication Fault
E1
Reliance tankless or hybrid water heater shows E1 and shuts down, no hot water
Water Flow Sensor / Low Flow Fault
E10
Reliance water heater displays E10 and shuts down, often accompanied by gurgling or boiling sounds.
Dry-Fire / No Water in Heat Exchanger or Tank
E2
Reliance water heater displays E2, and the burner or elements will not operate.
Outlet Temperature Sensor (Thermistor) Fault
E3
Reliance tankless or power vent water heater displays E3 and shuts down during operation.
Exhaust / Flue Temperature Overheat
E4
Reliance water heater displays E4 and will not ignite or heat.
Inlet Temperature Sensor (Thermistor) Fault
E5
Reliance tankless or hybrid water heater displays E5 and shuts down shortly after starting.
Overheat / High Limit Thermostat Trip
E6
Reliance water heater displays E6 and does not heat properly.
Tank / Internal Temperature Sensor Fault
E7
Reliance tankless water heater displays E7 and will not ignite.
Ignition Failure / Flame Not Detected
E8
Reliance water heater displays E8 and shuts down during operation.
Fan / Blower Motor Fault
E9
Reliance water heater displays E9 and will not operate.
Gas Valve / Gas Control Fault
F1
Reliance hybrid/heat pump water heater displays F1 and runs only in backup electric mode or not at all.
Heat Pump Compressor Fault
F2
Reliance hybrid water heater displays F2, and heat pump mode is disabled.
Evaporator Coil Temperature Sensor Fault
F3
Reliance hybrid water heater shows F3, and may shut down heat pump operation.
Condenser Coil Temperature Sensor Fault
F4
Reliance hybrid water heater displays F4, and the fan may not run.
Heat Pump Fan Motor Fault
F5
Reliance hybrid water heater shows F5, and may stop heating in heat pump mode.
Ambient Air Temperature Sensor Fault
F6
Reliance hybrid water heater displays F6, and may revert to electric-only mode.
Refrigerant System Protection / High or Low Pressure Fault
F7
Reliance hybrid water heater shows F7, and may not respond to control inputs.
User Interface / Display Board Fault
F8
Reliance hybrid water heater displays F8, and may not heat efficiently.
Tank Temperature Sensor Disagreement / Calibration Fault
F9
Reliance hybrid water heater shows F9, and may lock out heating.
Leak Detection / Condensate Overflow Fault (if equipped)
None
Pilot light will not stay lit on Reliance atmospheric gas water heater.
Thermocouple / Flame Sensor Failure
Symptom
Condensation or water pooling on top of or around Reliance water heater shortly after installation
Normal Condensation or Minor Fitting Leaks
Symptom
No hot water from Reliance electric water heater (both elements off, no error code).
Tripped High-Limit Reset or Failed Upper Thermostat
Symptom
Reliance electric water heater has some hot water but runs out quickly.
Failed Lower Heating Element or Lower Thermostat
Symptom
Reliance hybrid water heater runs fan/compressor constantly but water is not getting hot enough
Insufficient Heat Pump Capacity or Sensor Misreading
Symptom
Reliance power vent water heater fan runs but burner does not ignite
Pressure Switch or Air Proving Switch Fault
Symptom
Reliance tankless water heater cycles on and off rapidly (temperature swings at fixtures)
Short Cycling Due to Flow or Gas Issues
Symptom
Reliance water heater leaking from the bottom or around the drain valve.
Leaking Drain Valve or Tank Failure
Symptom
Reliance water heater leaking from the top around hot or cold connections.
Leaking Dielectric Nipples or Loose Pipe Connections
Symptom
Reliance water heater outer jacket feels excessively hot to the touch
Insulation Degradation or Overheating
Symptom
Reliance water heater trips the electrical breaker repeatedly
Electrical Short or Overcurrent in Heater Circuit
Symptom
Rust-colored or discolored hot water from the Reliance water heater.
Corroded Anode Rod or Tank Interior Corrosion
Symptom
The Reliance gas water heater burner will not light, but the pilot stays lit.
Faulty Gas Control Valve or Clogged Main Burner Orifice
Symptom
The Reliance water heater makes loud banging or hammering noises when water is turned on or off.
Water Hammer / Plumbing Shock
Symptom
The Reliance water heater makes popping or rumbling noises during heating.
Sediment Buildup on Tank Bottom or Heat Exchanger
Symptom
The Reliance water heater produces a rotten egg or sulfur smell in the hot water.
Anaerobic Bacteria Reaction with Magnesium Anode Rod
Symptom
The temperature and pressure (T&P) relief valve on the Reliance water heater is dripping or discharging water.
Excessive Pressure or Temperature / Faulty T&P Valve
Symptom
Water is too hot from the Reliance water heater (scalding at taps).
Thermostat Stuck Closed or Set Too High
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Digital Reliance water heater display shows E0 and unit will not heat water
|
Control Board Communication Fault | View Details |
| E1 |
Reliance tankless or hybrid water heater shows E1 and shuts down, no hot water
|
Water Flow Sensor / Low Flow Fault | View Details |
| E10 |
Reliance water heater displays E10 and shuts down, often accompanied by gurgling or boiling sounds.
|
Dry-Fire / No Water in Heat Exchanger or Tank | View Details |
| E2 |
Reliance water heater displays E2, and the burner or elements will not operate.
|
Outlet Temperature Sensor (Thermistor) Fault | View Details |
| E3 |
Reliance tankless or power vent water heater displays E3 and shuts down during operation.
|
Exhaust / Flue Temperature Overheat | View Details |
| E4 |
Reliance water heater displays E4 and will not ignite or heat.
|
Inlet Temperature Sensor (Thermistor) Fault | View Details |
| E5 |
Reliance tankless or hybrid water heater displays E5 and shuts down shortly after starting.
|
Overheat / High Limit Thermostat Trip | View Details |
| E6 |
Reliance water heater displays E6 and does not heat properly.
|
Tank / Internal Temperature Sensor Fault | View Details |
| E7 |
Reliance tankless water heater displays E7 and will not ignite.
|
Ignition Failure / Flame Not Detected | View Details |
| E8 |
Reliance water heater displays E8 and shuts down during operation.
|
Fan / Blower Motor Fault | View Details |
| E9 |
Reliance water heater displays E9 and will not operate.
|
Gas Valve / Gas Control Fault | View Details |
| F1 |
Reliance hybrid/heat pump water heater displays F1 and runs only in backup electric mode or not at all.
|
Heat Pump Compressor Fault | View Details |
| F2 |
Reliance hybrid water heater displays F2, and heat pump mode is disabled.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| F3 |
Reliance hybrid water heater shows F3, and may shut down heat pump operation.
|
Condenser Coil Temperature Sensor Fault | View Details |
| F4 |
Reliance hybrid water heater displays F4, and the fan may not run.
|
Heat Pump Fan Motor Fault | View Details |
| F5 |
Reliance hybrid water heater shows F5, and may stop heating in heat pump mode.
|
Ambient Air Temperature Sensor Fault | View Details |
| F6 |
Reliance hybrid water heater displays F6, and may revert to electric-only mode.
|
Refrigerant System Protection / High or Low Pressure Fault | View Details |
| F7 |
Reliance hybrid water heater shows F7, and may not respond to control inputs.
|
User Interface / Display Board Fault | View Details |
| F8 |
Reliance hybrid water heater displays F8, and may not heat efficiently.
|
Tank Temperature Sensor Disagreement / Calibration Fault | View Details |
| F9 |
Reliance hybrid water heater shows F9, and may lock out heating.
|
Leak Detection / Condensate Overflow Fault (if equipped) | View Details |
| None |
Pilot light will not stay lit on Reliance atmospheric gas water heater.
|
Thermocouple / Flame Sensor Failure | View Details |
| – |
Condensation or water pooling on top of or around Reliance water heater shortly after installation
|
Normal Condensation or Minor Fitting Leaks | View Details |
| – |
No hot water from Reliance electric water heater (both elements off, no error code).
|
Tripped High-Limit Reset or Failed Upper Thermostat | View Details |
| – |
Reliance electric water heater has some hot water but runs out quickly.
|
Failed Lower Heating Element or Lower Thermostat | View Details |
| – |
Reliance hybrid water heater runs fan/compressor constantly but water is not getting hot enough
|
Insufficient Heat Pump Capacity or Sensor Misreading | View Details |
| – |
Reliance power vent water heater fan runs but burner does not ignite
|
Pressure Switch or Air Proving Switch Fault | View Details |
| – |
Reliance tankless water heater cycles on and off rapidly (temperature swings at fixtures)
|
Short Cycling Due to Flow or Gas Issues | View Details |
| – |
Reliance water heater leaking from the bottom or around the drain valve.
|
Leaking Drain Valve or Tank Failure | View Details |
| – |
Reliance water heater leaking from the top around hot or cold connections.
|
Leaking Dielectric Nipples or Loose Pipe Connections | View Details |
| – |
Reliance water heater outer jacket feels excessively hot to the touch
|
Insulation Degradation or Overheating | View Details |
| – |
Reliance water heater trips the electrical breaker repeatedly
|
Electrical Short or Overcurrent in Heater Circuit | View Details |
| – |
Rust-colored or discolored hot water from the Reliance water heater.
|
Corroded Anode Rod or Tank Interior Corrosion | View Details |
| – |
The Reliance gas water heater burner will not light, but the pilot stays lit.
|
Faulty Gas Control Valve or Clogged Main Burner Orifice | View Details |
| – |
The Reliance water heater makes loud banging or hammering noises when water is turned on or off.
|
Water Hammer / Plumbing Shock | View Details |
| – |
The Reliance water heater makes popping or rumbling noises during heating.
|
Sediment Buildup on Tank Bottom or Heat Exchanger | View Details |
| – |
The Reliance water heater produces a rotten egg or sulfur smell in the hot water.
|
Anaerobic Bacteria Reaction with Magnesium Anode Rod | View Details |
| – |
The temperature and pressure (T&P) relief valve on the Reliance water heater is dripping or discharging water.
|
Excessive Pressure or Temperature / Faulty T&P Valve | View Details |
| – |
Water is too hot from the Reliance water heater (scalding at taps).
|
Thermostat Stuck Closed or Set Too High | View Details |
No matching codes found
Advertisements