Water Heating Systems

Seisco Tankless Heaters

Electric Water Heaters

Level Detector Replacement

There are two level detector sensors (brass screws) that thread into the top of the heating chambers. They are located between cylinders 1 & 2 and cylinders 3 & 4. There is one yellow wire connected to each sensor and it’s other end to the top of the control board.

Required Tools:

• Phillips screw driver
• battery powered volt meter
• rag

Warning: To avoid electrical shock, make sure that all of the power is off to the heater before attempting to remove the old level detector and while installing the new level detector.

1. Turn off all the power to the heater. Confirm the power is off with a voltmeter, even if the status light (or LED) on the control board is off. There may be multiple breakers powering your model heater.
2. Open a hot water faucet nearby. While the water is running, turn off the water supply to the heater. This will help siphon some of the water out of the heater.
3. Remove the level detector screw with a Phillips screw driver. Use the rag to dry up any water that may drip from the hole left by the removed screw. Save the wire lug and yellow wire for the new or replacement level detector screw.
4. Install a new seal by threading it onto the new level detector screw. Install the wire lug and screw the new level detector assembly into the threaded chamber with the Phillips screw driver. Do not over tighten, 8 inch-lbs. maximum torque. The seal will do the work.
5. Fill up the heater with water. If there are no leaks, turn the power back on.

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