Girard Products GSWH-1 Service Manual page 19

• If it is not stuck, check for low voltage, or hard to operate switch. If the water heater comes
on one time, but will not start the second time, check to see that the sail switch is not stuck
in the forward position, when the water heater shuts off. If it is, adjust, as indicated above.
MORE ABOUT THE BOARD
WE HAVE TALKED ABOUT THE BORD AND THE MOTOR OPERATION. Now we will discuss the
remaining functions. There are three locations where wires enter the board:
Bottom of board:
1. Blower (BLO) black wire from board to motor.
2. Power (PWR) red wire into board. As long as the on/off switch is turned on there will be
power at this wire.
Top of Board:
On the top there are 5 wires going into the white block:
When the water heater is activated:
1. Power comes in on the orange wire from the ECO. If no power here, go back and check
ECO.
2. Red Wire, power comes from sail switch, when it is activated. No power, check sail switch.
3. Blue Wire, Light circuit. This is the LED diagnostic lite. This light will flash one time upon
ignition. It will stay on for a short time during relight and it will flash multiple times to
indicate a problem.
4. Brown Wire, when the board is activated the brown wire sends power to the gas valve. If
valve fails to open, check to confirm that all wires are connected to the valve. If wires are
connected, confirm power out of the board at the brown wire. If no power, replace board.
If there is power, do an OHMS test at each coil. Should be 30 to 50 OHMS. Not proper or
no reading, replace valve.
5. Black Wire, this is a ground wire and must be attached to the ground strap.
Gas Valve
To test for proper pressure at the gas valve, there is a tap at the front of the valve. Using a
3/16 allen wrench. Remove the plug from the valve. Install a ¼ inch barb, for the plastic
hose for the manometer. Proper pressures listed below.
Series 1
High - 10.5 IWC (Inches of water column)
Low - 7.0 IWC
Series M
High - 10.0 IWC
Low - 11.5 IWC
Before replacing the gas valve, be sure that the (main tank regulator) has been tested. In
most cases the problem is on the tank regulator, rather than the water heater valve.
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