How To Repair A Furnace Gas Valve

Gas Furnace Components - Gas Valve Troubleshooting Gas Valve Troubleshooting - Gas valves used in modern country-of-the-fine art residential gas furnaces are typically controlled via a state-of-the-art electronic ignition command or a printed circuit lath. Other types of gas valves include the standing airplane pilot gas valve.

Gas valves can be found on gas furnaces, gas-fired steam boilers or hot water boilers, and gas-fired water heaters. With gas valve troubleshooting and any "gas valve" issues, safety is always offset.

When troubleshooting a gas valve, the technician should only be concerned with input to the gas valve and output of the gas valve, whether it is an electronic module or excursion board controlled gas valve, or a standing airplane pilot gas valve. The input with gas valve troubleshooting includes ensuring the safety excursion is good.

Gas Valve Troubleshooting | Electronic Ignition Gas Valve Troubleshooting

Gas valve troubleshooting looks for a problem. If something is incorrect with the internal components of the gas valve, the gas valve should exist replaced. The gas valve cannot exist repaired in the field. Only the gas valve manufacturer or someone certified past the manufacturer of the gas valve tin can make repairs. And then re-certifying the rubber of the gas valve.

This also applies to gas valves that take been submerged underwater due to flooding. Flooding of your banality or gas furnace or h2o heater. If the gas valve is plant to exist defective internally in any way, you need a new gas valve. Afterward a gas valve has been submerged or partially submerged, replace information technology with a new gas valve. That is a basic safety rule that all technicians or DIYers should follow when gas valve troubleshooting.

Electronic Ignition Gas Valve Basics

ignition control module with flash codes

Ignition Command Module by White-Rodgers (Now Emerson Electrical)

Any electronic component has a basic troubleshooting rule that every technician should follow when efficiently troubleshooting whatever electronic ignition gas component. The board should have an input and an output to follow a basic control sequence. The basic furnace command sequence for an electronic ignition control board typically originates at a thermostat for a call for oestrus. By initiating a phone call for heat from the thermostat the technician begins the procedure of the sequence of operation.

This completes a excursion to the master control. The electronic command or printed excursion lath for the gas furnace. The command sequence of functioning for an electronic ignition gas furnace will always include safeties to be proven before the gas electronic control lath or printed circuit board allows any output to the gas valve. The safety circuit in many gas furnaces including boilers volition include but are not limited to the following:

Components and Safe Switches of the Furnace

Gas Valve Repair The following components work in conjunction with the gas valve. With gas valve bug, including gas valve troubleshooting, all condom switches must be closed. All checks should be done to ensure the safeties are good before gas valve troubleshooting.

Forced Draft or Induced Typhoon Force per unit area Switch
Draft hood limit switches
Limit switches in or nearly the rut exchanger
Limit switches almost the furnace blower motor
Any other safety switch that tin exist opened by temperature or pressure. A switch that is integral to the safety circuit of the gas furnace. Each make of furnace is engineered differently. Come across the pictorial or the ladder diagram for all safeties engineered in the gas furnace. These diagrams can be establish inside the command of the furnace.

Safeties for the Furnace and Ignition

In "gas heating repair" prophylactic is always first. One time all the safeties are proven the electronic ignition control board will send a signal to the gas valve. The control will exist to open up either the primary valve (if it is straight ignition) or to lite the intermittent pilot lite. Whether it is straight ignition or intermittent airplane pilot light the flame must exist proven through a flame sensor. Proven to keep the sequence from restarting and trying the ignition sequence once again. If the flame cannot be proven then the system will close down for a predetermined amount of fourth dimension. +/- iv hours is typical.

If a flame cannot exist proven the manufacturer of the controls and the furnace practice not want the gas furnace continuously trying for ignition. This is because a dangerous amount of gas can accumulate resulting in serious damage to a structure or people. If the flame is proven the sequence continues until the thermostat is satisfied and everything shuts down until the thermostat again calls for estrus and and so the whole sequence has to be proven once more so the furnace tin provide rut.

Gas Valve Issues

Manual Reset Limit Switch

Standing Pilot Gas Valves

Everything that applies to the electronic ignition sequence of performance by the manner of the safety circuit must be proven earlier the gas furnace will allow the gas valve to burn the principal burners to provide heat. The difference is the standing airplane pilot gas furnace always has a airplane pilot light on. Kickoff. exam the thermocouple. Accommodate airplane pilot flame every bit necessary to make sure the thermocouple is getting enough estrus. If it however doesn't work then you could have a bad coil in the gas valve.

Again, if yous are non properly trained in the functionality of gas furnaces and basic condom practices yous should telephone call a professional. Meet our disclaimer. Working on HVAC equipment tin can be hazardous. Telephone call a professional whenever your gas furnace is non working properly.

High Performance HVAC