4.11.8 Main Gas Valve
Part
1. To control the amount of gas supplied to the burner based on fan speed.
Function
2. When the unit experiences abnormal combustion, it shuts off the gas valve automatically and prevents
unsafe situations.
Failure Event
Unable to open/close
1. No flames.
Effects
2. No operation of the unit.
Error Code
E003, E012
1. Visual inspection: Connection and/or breakage of wires.
Diagnostic
2. Voltage check: Check range of voltage shown below.
RED-YELLOW: DC 22~24 V
Color/Number
●
of wires
WHITE-RED: DC 22~24 V
●
Check Point
Test P
with
out
manometer for
specified pressure
range to ensure
that the Gas Valve is
operating properly.
System Details
65