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Tools Required for Service
Manometer:
Two types available, a liquid “U” tube type or a digital (magnehelic) type. This device is
used to measure gas and/or air pressures and vacuum.
Multi-Meter:
A digital type is strongly recommended. This device is used to measure electrical values.
The meter must have the capability to measure volts AC, volts DC, amps, micro-amps, and ohms.
Thermometer:
Used to measure water temperature. An accurate thermometer is recommended.
Water Pressure Gauge:
Used to measure water supply pressure, and to determine tank pressure by
adapting to the drain valve of the heater.
Jumper Leads:
A length of wire (12 in. minimum) with an alligator clip at both ends.
Various Hand Tools:
Pipe wrench, channel locks, open end wrench set, 12 in. crescent wrench, Allen
wrench set, Torx bit set, screwdrivers (common & Phillips), long reach (12 in.) magnetic tip Phillips
head screw driver #2 tip, 1/4 in. nut driver, pliers (common & needle nose), socket set including a 1-
1/16 deep well socket, wire cutters, wire strippers, wire crimpers, torpedo level, small shop vac, step
ladder, and flashlight.
Features
Features of the Honeywell Integrated Control System
x
Water heater digital display on control board for setting and displaying the temperature setpoint.
Pressing temperature UP and DOWN buttons changes the temperature setpoint. Temperature
format may be displayed in °F or °C.
x
Single control board with plug-in wiring controls temperature, ignition, and blower operation.
x
Plug-in wiring reduces chance of miswiring.
x
Burner ignition with direct spark ignition - A high voltage spark jumps from the spark rod to the
burner surface to ignite the gas.
x
Water heater digital display will show diagnostic codes in the event the water heater needs servicing.
Aids in diagnosing and servicing the water heater.
x
Water heater digital display can show previous error code history to further aid in servicing the water
heater.
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Summary of Contents for EF120T4003N3
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