Dometic G6A-8E Service Manual page 14

General Information
1. With the wall switch turned On, 12 VDC power is
sent out of the switch and into the brown wire on the
wire harness.
2. Power passes through the thermostat and the
thermal cut-off and into the control board through
the brown wire.
3. DC voltage goes out of the control board on the
red wire, moves through the E.C.O., and opens the
valves to allow gas to flow through the gas solenoid
valve.
4. Voltage leaves the ignitor circuit on the control
board to create a spark. The ignitor attempts to light
for seven seconds.
a. If the unit lights, the electrode heats up and sends
a ground signal to the control board. The ignitor
stops sparking and the valves stay open during
the heating process.
b. If the unit fails to ignite, there is an approximate
10-second delay before the next attempt.
c. After three failed ignition attempts, the Water
Heater goes into lockout mode.
On Demand Models
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8 On Demand Water Heater Operation Flow
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1. With the wall switch turned On, 12 VDC power is
2. Once water flow exceeds 0.8 gpm (3.0 lpm), a
3. After receiving power at the relay, power is sent to one
4. Once airflow is established, the pressure switch
5. DC voltage travels on the red wire from the control
6. Voltage leaves the ignitor circuit on the control
7. After three failed ignition attempts, the Water Heater
Gas Only - Pilot Model
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1. Once the pilot light is lit and the lighting control dial
2. The heated thermocouple generates millivoltage to
3. When the thermostat calls for heat, the gas control
4. The pilot ignites the gas when it reaches the end of
sent out of the switch and into the red wire on the
wire harness. The voltage moves through the
3 A fuse, through the E.C.O., where it splits off
into two directions, one to the relay and one to the
modulating valve.
poppet lifts off of a seat. Magnets in the poppet
activate a proximity switch on the front of the
modulating valve, closing the switch and passing
power to the relay coil.
side of the pressure switch and to the blower motor.
closes and sends power into the brown wire on the
control board.
board to the gas solenoid valve.
board to create a spark. The ignitor attempts to light
for six to eight seconds.
goes into lockout mode and the lockout lamp
illuminates.
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Gas Only - Pilot Water Heater Operation Flow
is in the On position, the thermocouple is heated.
the gas control's magnet assembly that allows gas to
flow freely to the pilot.
supplies gas to the main burner.
the burner tube.
Water Heater
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