Guardian PowerVent Training Manual SVC900; Rev 1
Page 44
RESET PROCEDURES FOR INVENSYS CONTROL
1. Inspect the installation/location for the presence of materials that could produce flammable
vapors (ex: gasoline, cleaning compounds, paints/solvents) or the presence of bleach or
ammonia. Remove any of these materials and thoroughly ventilate the area where water heater is
located. If the area is not clear of flammable vapors, the sensor will re-trip immediately.
2. Interpret flash code (Refer to SVC-900 pages 17 thru 20)
a. 2-1: Flammable vapors present
b. 2-3: FVD Interface Failure/Miswiring
3. Turn off blower power switch on water heater and unplug power cord.
4. Disconnect flammable vapor sensor wire connector from control valve and measure
electrical resistance between connector test points.
Figure 14 – Invensys Reset Procedure
a. Sensor resistance should be above 9k ohms and below 45k ohms. If the sensor is
within this range, proceed to Step 5.
b. If the sensor resistance is less than 9k ohms or greater than 45k ohms, replace the
sensor and sensor wire harness.
5. Re-install the sensor wire connector to the control valve, re-install the wire cover, and
follow the reset instructions below:
Resetting the control for “2-1” or “2-3” error codes. The following steps must only be
performed after completing the above procedure.
1. Place the red temperature setting dial on Vacation.
2. Reapply power to the water heater and wait for 3 seconds for the system self-diagnostic
check.
3. Within the first 30 seconds, the temperature dial must be rotated back and forth crossing
the 120 degree mark at least six (6) times. (You can do this by rotating the red dial from
Vacation to Hot to Vacation……)
4. This will reset the control and display a normal flash code (slow blinking).
5. If (2-1) or (2-3) flash code persists replace the control module and sensor.
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