John-wood Noritz N-069M-DV User Manual download pdf (Page 22)

Temperature

Troubleshooting-2

The water is cold when only a

single fixture is open.

• The unit will not heat the water if the flow rate is less than

0.7 gallons per minute.

Open the fixture more or open other fixtures so that a greater

flow passes through the unit, and the unit should begin

heating again.

•Are the gas and water supply valves fully open?

• Is the water temperature setting appropriate?

(

p.12 and p.13)

• If the amount of hot water required is very high, it is

possible for the temperature to be lower than the temp-

erature set on the remote controller.

Decrease the amount of water passing through the unit

and the temperature should stabilize.

The water is not hot enough.

Amount of Hot Water

The amount of hot water at a

certain fixture is not constant.

•When hot water is demanded at other fixtures, the

amount available may be reduced. The maximum flow

available from this unit is 6.9 GPM at a 45°F temp. rise.

• Pressure fluctuations and other plumbing conditions can

cause the temperature and pressure at a fixture to be

unstable, but it should stabilize after a short time.

• There are some types of hot water taps that discharge large

volumes of hot water initially, but stabilize after time.

•To keep the temperature stable, the heater limits the

amount of water that can flow through it to a small

amount initially, but the amount increases over time.

The amount of hot water in the tub

is less/more than the set amount.

•When hot water is used for other fixtures while filling the

bath tub, the tub will not fill as much.

• If there is water in the tub already, or when filling is stopped

and resumed, the tub will fill more.

The flow meter alarm does not

sound even when filled to the set

amount.

•

The flow meter alarm is set to sound when hot water

is continuously discharged for the set volume of water. If mixing

valves are used, or if cold water is mixed with hot water at the

fixture, the tub will fill more than the setting of the flow meter

alarm.

Amount of hot water available

has decreased over time.

• Is the water drain valve filter clogged? (

p.20)

Fluctuations in hot water

temperatures.

• Set water temperature at 115°F to 120°F. This will allow you

to use a higher flow of hot water thus meeting the minimum

flow requirement of 0.7 gpm.

•Clean the water filter of any debris (

p.20)

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John-wood Noritz N-069M-DV User Manual Page 22

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