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TANKLESS
WATER HEATERS
Models & Prices
Tankless Water Heater Product Guide
Description / Specification
Tankless Water Heater Applications
Residential / Commercial
Tankless Water Heater Electrical Guide
Service Calculations
Tankless Water Heater Installation
Plumbing / Electrical
Tankless Water Heater Cost Comparisons
Reports / Listings
Tankless Water Heaters Service Guide
Remove / Repair
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TEMPERATURE SENSOR REPLACEMENT
Required Tools: Small
opened ended box wrench, deep socket wrench or crescent wrench, needle
nose pliers, battery powered volt meter, bucket.
WARNING: To avoid
electrical shock, make sure that all of the power is off to the heater
before attempting to remove the old thermistor and while installing the
new thermistor.
Thermistor #4 or TH-4 shown with ohm meter probes
attached to measure resistance.
The TH-IN thermistor is located under the right side of the heater directly
below the inlet fill tube. TH1 and TH3 are located near the top of chambers
2 and 4. TH2 and TH4 are located near the bottom of chambers 2 and 4.
- 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.
- 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.
- For TH1, TH2, TH3 and TH4, remove the green wire with needle
nose pliers and pull the red capped wire from the stud on the end
of the thermistor.
- For TH-IN (the inlet thermistor), remove the green wire with
needle nose pliers and the red wire by loosening the hex nut
with a wrench while holding the back nut with pliers or
another wrench.
- Next, while removing any of the thermistors with a socket
wrench or box wrench, have a bucket ready to collect
water that will drain from the hole that the thermistor occupied in
the chamber.
- Install the new thermistor making sure the new seal is positioned
around the collar of the thermistor.
- Turn the thermistor clockwise by hand. Caution: Only
use the wrench to make the thermistor snug and only tightened to 14
in.-lbs., which is a little past finger tight. The seal will do the
work to prevent leaking not the tightness.
- Reconnect the green and red wires to the thermistor.
- If any water dripped onto the control board, use a hair dryer
to dry the board and the rest of the heater. Make sure to dry behind
the board as well. The heat from the hair dryer will not harm the control
board.
- Fill up the heater with water. If there are no water leaks,
turn the power back on.
Note: If the heater sounds an alarm and a 126 diagnostic
code appears, turn the power off, check for leaks again and dry the entire
heater thoroughly. The alarm means that moisture was detected and the
control disabled the heater.
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