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5-3
TROUBLESHOOTING
TANKLESS WATER HEATER 199
Figure 42: Domestic Hot Water
Temperature Sensor S3
5.2.3 Flue Gas Temperature Sensor
This sensor ensures that the unit shuts down safely if the flue temperature
is above normal. High flue temperatures can be an indication that the heat
exchanger requires cleaning.
The flue gas temperature sensor is located at the top of the rear flue passage,
below the top panel. To remove the sensor, unclip from the wiring harness and
unscrew from the rear flue passage.
5.2.4 Domestic Hot Water Flow Sensor
The unit is equipped with a flow sensor to measure water flow through the
domestic hot water circuit in the water heater. The flow sensor consists of two
parts, the mechanical turbine in the cold water inlet and the external inductive
sensor surface mounted on the outside of the cold water inlet. The minimum flow
required to activate the water heater is 0.5 GPM or 2 L/min.
To service or replace the mechanical turbine:
1.
Disconnect power to the unit.
2.
Turn off the cold and hot water valves below the unit, release the water
pressure and then drain the domestic hot water circuit. Leave the drain valves
open.
5.2.5 Domestic Hot Water Sensor
The unit is equipped with a domestic hot water temperature sensor. The sensor is
surface mounted on the hot water outlet pipe.
Figure 40: Flue gas Temperature
Sensor S5
Figure 41: Domestic Water Flow
Sensor