18
Troubleshooting
The hot water is not the correct temperature.
• Is the hot water fixture/faucet sufficiently open?
Water takes time to become hot when turning
the hot water fixture/faucet.
• Have you allowed enough time for the cold water
in the pipes to drain out?
The water is too hot.
• Are the gas and water supply valves fully open?
• Is the water temperature setting appropriate?
(See page 10)
• If the water supply temperature is high, it is
possible for the temperature to be higher than
the temperature set on the Remote Controller.
• If only a small amount of hot water is demanded,
it is possible for the temperature to be higher
than the temperature set on the Remote
Controller.
The water is not hot enough.
• Are the gas and water supply valves fully open?
• Is the water temperature setting appropriate?
(See page 10)
• If the amount of hot water required is very
high, it is possible for the temperature to be
lower than the temperature set on the Remote
Controller. Decrease the amount of hot water
passing through the Water Heater and the
temperature should stabilize.
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 0.29 GPM (1.1 L/min)*.
Open the fixture more or open other fixtures so
that a greater flow passes through the unit, and
the unit should begin heating again.
*Minimum activation flow rate: 0.5 GPM (2.0 L/min)
Minimum operating flow rate: 0.29 GPM (1.1 L/min)
Fluctuations in hot water temperatures.
• Set water temperature at 115°F to 120°F or 48°C
(118°F) to 50°C (122°F). This will allow you to
use a higher flow of hot water thus meeting the
minimum flow requirement of 0.29 GPM (1.1 L/
min)*.
*Minimum activation flow rate: 0.5 GPM (2.0 L/min)
Minimum operating flow rate: 0.29 GPM (1.1 L/min)
• Clean the water filter of any debris. (See page 16)
Setting temperature cannot rise.
• Is the maximum temperature setting
appropriate? (See page 11)
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 NRCR111DV
(GQ-C3260WXQ-FF US) is 8.7 GPM (33 L/min) at
a 45°F (25°C) temperature rise.
The maximum flow available from NRCR92DV
(GQ-C2660WXQ-FF US) is 7.1 GPM (27 L/min) at
a 45°F (25°C) temperature 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
discharges large volumes of hot water at first but
stabilize after time.
• To keep the temperature stable, the Water
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 tub, the tub will not fill as much.
• If there is water in the tub already, or when filling
is stopped and restarted, the tub will fill more.
Amount of hot water available has decreased
over time.
• Is the water filter clogged? (See page 16)
• If the supply water is hard and has not been
treated, scale can build-up in the Water Heater
and decrease the maximum amount of hot water
available. Scale can be removed from the Water
Heater by flushing the Water Heater periodically.
To prevent scale from forming in the Water
Heater, a water softener or scale inhibitor is
recommended.
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.
Hot Water Delivery
Hot water is taking too long.
• The Water Heater automatically learns based on
water usage patterns. It may take several days to
properly adjust to your schedule. Usage pattern
may have also been reset if the Water Heater has
not been utilized for 3 days or more. (Refer to
page 9 for more details)
No recirculation activation.
• When using this Water Heater in On-Demand
Mode, The Auto-Recirculation feature does not
meet the requirements for this standard. To
use the recirculation mode according to Title
24 standard, push the On-Demand Switch to
manually operate the recirculation pump.
