ERROR MESSAGES

Rinnai water heaters have the ability to check their own operation continuously. If a fault occurs, an error code will flash on the Digital Display if you have temperature controllers installed. This assists with diagnosing the fault, and may enable you to overcome a problem without a service call. Please quote the code displayed when enquiring about service. Some of these remedies can not be checked by the user because they require the front to be taken off of the unit. They are included so that you can give the information to the gas engineer.

Code

Fault

Remedy

Displayed

 

 

 

 

 

-

Noticeable reduction in water

Inlet water filter needs to be cleaned.

 

flow

 

 

 

 

10

Not enough combustion air

Check for physical blockages around

 

 

air intake or exhaust. Check combus-

 

 

tion fan.

11

No Ignition / Gas supply

Check gas valves, gas supply and

 

 

ignition unit.

 

 

 

12

Flame failure / Earth Leakage

Check gas valves and gas supply.

 

 

Check flame rod.

 

 

Check earth wire lead.

 

 

Check remote control.

 

 

 

14

High flame safety device

Check overheat circuit

 

 

 

16

Over temperature warning

Modulating control valve problem or

 

 

water flow control valve problem

32

Outgoing water temperature

Check Hot Water Thermistor and wire

 

sensor faulty

 

 

 

 

34

Combustion Air temperature

Check Air Intake Thermistor and wire

sensor faulty

 

 

 

 

 

 

52

Gas modulating valve faulty

Check gas modulating valve and pcb.

 

 

 

61

Combustion fan failure

Check Combustion Fan

 

 

 

71

Micro-processor failure or Sole-

Check solenoids and pcb.

 

noid circuit failure

 

72

Flame rod circuit error

Check flame rod and pcb.

 

 

 

*In all cases, you may be able to clear the Error code by turning the hot water tap OFF, then ON again. If this does not clear the error, try pushing the On/Off button OFF then ON again. If the Error Code still remains contact Rinnai or your nearest service agent for advice.

**Faults caused by insufficient gas/water supply or gas/water quality and installation errors are not covered by the manufacturer’s warranty.

Regular maintenance should be performed by a competent person in accordance with the local regulations at least once annually.

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Rinnai REU - 16 FUA - E user manual Error Messages, Code Fault Remedy Displayed
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REU - 16 FUA - E specifications

The Rinnai REU-16 FUA-E is a cutting-edge tankless water heater designed for efficiency and convenience. This model is part of Rinnai's renowned line of high-performance appliances, catering to both residential and commercial applications. It boasts a sleek design coupled with advanced technology that sets it apart in the crowded water heating market.

One of the most notable features of the REU-16 FUA-E is its impressive heating capacity. It is capable of delivering hot water on demand, with a maximum output of 16 liters per minute. This means you can comfortably run multiple hot water fixtures simultaneously without experiencing a drop in temperature or flow rate. Whether you’re taking a shower, running the dishwasher, or washing clothes, this unit meets the demand with ease.

The REU-16 FUA-E employs a state-of-the-art condensing technology, which enhances its efficiency by capturing and reusing some of the heat that would otherwise escape through the flue. This allows for an energy efficiency rating of up to 95%, significantly reducing energy bills and environmental impact compared to traditional storage water heaters.

Another key characteristic of this unit is its compact size. The Rinnai REU-16 FUA-E can be installed in smaller spaces, making it an ideal option for apartments, houses, or commercial properties with limited room for bulky tank units. Its flexibility in installation positions—whether indoors or outdoors—provides additional versatility to users.

Safety is also a primary concern with the REU-16 FUA-E. It comes equipped with numerous safety features, including an anti-freezing function, overheat protection, and venting safety controls. These safeguards ensure safe operation for you and your family, providing peace of mind whether it’s running constantly or in standby mode.

In terms of controls, the Rinnai REU-16 FUA-E offers modern digital displays that provide real-time monitoring of water temperature and status. This user-friendly interface makes it easier for homeowners or users to adjust settings according to their preferences.

Overall, the Rinnai REU-16 FUA-E encapsulates innovation and efficiency in water heating. Its combination of advanced technology, high performance, compact design, and safety features makes it a reliable choice for those seeking a consistent supply of hot water without the limitations of traditional systems. Whether for residential use or commercial applications, the REU-16 FUA-E is engineered to provide lasting performance and convenience.
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