Rinnai RJ12RML User Instructions page 29

Issues of hot water supply and temperature
No hot water
supplied
No hot water
supplied immediately
Hot water flow is
fluctuated
Hot water
temperature is too
high
Hot water
temperature is too
low
Troubleshooting
 Check if the gas supply is normal and without suspension.
 Check if the water is running out from water tap normally.
 Check if the cold water filter is being blocked.
 Check if the power supply is normal.
 Fully turn on the gas meter valve and/or gas supply valve of appliance.
 Fully turn on the cold water valve and/or hot water tap.
 After turning on the power supply of appliance, press the ON/OFF
button on front panel control or remote control (if applicable).
 After turning on the power supply, press the ON/OFF button on front
panel control or remote control (if applicable).

There is a distance between the appliance and the hot water tap,
therefore, hot water cannot be supplied immediately.
 When the appliance is supplying hot water to a water tap with another
water tap using hot water at the same time, the hot water flow will be
reduced. Depending on the conditions of water supply pressure and
pipework, hot water flow may be reduced suddenly or with a
discontinued water flow situation. After the conditions of water supply
pressure and pipework are stabilized, hot water flow will be stable.
 Due to the differences in product features of water tap, variation of hot
water flow may be special feature of particular product. For example:
hot water flow will be higher at the beginning and water flow will be
stabilized afterward.
 Fully turn on the cold water valve and/or hot water tap.
 Check if the set hot water temperature is appropriate.
 In summer, there may be occasional extremely hot weather where
supply water temperature is exceptionally high or required water flow is
too low, hot water temperature of appliance may be relatively higher.
You may adjust water faucet or shower tap to mix with cold water for
attaining suitable water temperature.
 Fully turn on the gas meter valve and/or gas supply valve of appliance.
 Check if the set hot water temperature is appropriate.
 In winter, there may be occasional extremely cold weather where supply
water temperature is exceptionally low or required water flow is too high,
hot water temperature of appliance may be relatively less. You may
appropriately reduce the hot water flow by adjusting water faucet or
shower tap to attain the suitable water temperature.
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