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Activity B | Flow Meter Troubleshooting
The flow meter is located on the inlet side of the water heater and has 4 Phillips head screws and a small
black wire (see image above). The flow meter is equipped with a small propeller that must spin freely
counter clockwise in order to activate heater. The flow meter controls the activation of the water heater by
sensing water flow. If the flow meter is functioning properly, the LED display will illuminate once water is
flowing through the system and will continue to stay illuminated while water is running. If the LED display
not illuminated while water is running, follow the steps below.
If this is not a new installation (same-day install) skip Step 1.
1. Check to make sure your water lines are not crossed. Your cold water inlet is located on the right
side of the heater. Water must flow right to left in order to activate heater. To verify water lines are
connected correctly follow these steps.
a. Turn OFF breakers
b. Turn OFF incoming water line (per national plumbing codes, there must be a shut-off valve
within 5 to 10 feet from the water heater)
c. Unscrew outlet water line and place bucket under outlet water line on heater
d. Slowly turn water valve back on and check to see if water is flowing out of the heater, or out of
the disconnected water line.
i. If you find the water is flowing out of the disconnected water line, your water lines are
crossed and must be swapped.
ii. If water is flowing out of the heater, water lines are properly connected. Reconnect water
pipes and move on to Step 2.
2. To clean out flow meter, run a high volume of water through your system to flush out any particles
that may be preventing the flow meter from spinning freely.
a. Run at least 5 to 6 GPM for 3 minutes. This could be a bath tub, shower, and a sink, or two
showers and a sink running simultaneously.
b. Once you have a high volume of water flowing through your heater, check that LED display is
illuminated. This can take up to 3 minutes.
i. You may hear a loud humming noise coming from the heater; this is normal.
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Flow meter
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Troubleshooting
