No flame on left side/main valve. Right side lights, flames up
Unit element will ignite,
gas on right valve will ignite, flame up and blow
left valve/gas will not ignite or flame up
Unit then shuts down
Have tried reset and cleaning flame sensor on left side
Does not appear gas is coming out of left side.
Checked valve nozzels, seems clean/clear
The main gas valve is a Honeywell VR8205H 8016 -
at least 15 years old
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Depending on the specific unit you have the hot surface igniter (glow stick) may be only for lighting the pilot, which then ignite the main burners. The flame has to be proved before the gas valve opens for the main burners. This is done by the flame rod, which could be faulty in your case. The proximity of the igniter could also prevent ignition. Check that the flame rod is clean and secure. Note. be very careful when servicing gas appliances, and never ever use lighters, matches or any other flame source to light them except for the ignition system supplied by the appliance. These appliances are designed and built with safety devices to prevent ignition when it senses a fault or malfunction. This is all for safety. Do not bypass safety devices, it can kill. Call a qualified tech.
1stly you have to understand what the pilot light does!
Yes, it lights the flame, but it protects you from gassing yourself!
that is thye main job!
hava a look inside!
In front of the pilot flame, (it might have a double flame... (one flame on the bottom & another on top.) is a curved piece of metal plate. The flame is supposed to heat that plate untill it it very hot! Thenm the plate bends down as it is a bimetyaalivc strip!
This opens the bsaety valve & you can let go.
The flame will noe stay on. If a gush of wind blows the flame out, the strip will cool & the safety valve close, preventing a dead family in the morning.
There is a newer system as well.
Right in front of the flame, is a pointed sensor with it's tip in the flame. . It has a electric cable running to a safety valve. This sensor have to heat up as well. It is a heat battery that activates the valve. See that it did not move!
If it heats up, & the valve does not keep the pilot flame going after a few seconds, the unit has to be replaced!
Look at the left burner, pipe,air hole adjustment,etc because it is operating good.
You will see a difference to it compared to the on the right.
The right pipe, air hole, or the length the pipe that are iserted in the gas control valve is different from the left.
The yellow flame indicates that not enough air is getting to the flame getting to the right flame ignition point.
The left flame is nice and blue...normal, the right is yellow indicating that not enough air is getting to the flame ignition point...look to see if the air hole adjustment is different than the one on the left...there is something open more or less, improperly adjusted.
Once you have it adjusted properly the right flame will burn bright blue just as it does on the left.
Please take time to rate me
This is potentially a very dangerous condition. First of all, think of the design, the flame sensor is there to shut the valve off if there is not good ignition on all burners. From what you said, it keeps the first burner on with no ignition to the other two? Do you smell gas when this occurs? There are two problems here, lack of flame cross-over to the left and your flame sensing safety failing. If the valve shuts off in a timely manner, then I would say clean the cross-over slots and verify manifold pressure is correct. The latter is more likely. If the safety is failing and not shutting off the gas valve, the control circuit board is defective. The wire coming from the flame sensor should return to a specific point on the control module and it reads micro amps to detect flame. Furnaces will either have a remote sensor as you describe or use the HSI, but not both. If your control module has been replaced, verify the sensor is connected correctly. Hope this helps and please rate my answer.
Between the burners is a small rail in the pressed steel where the flame runs across to light the other burners and it sounds like there is dirt or debris in the step over rails causing the problem. You will need to use some compressed air on those rails to clear them out. Once the rails are clear the other two burners should ignite right away.
. Several times of recyling power normally brings the furnance up. Though the failure code has always been 31, there are several different behaviour when the blower starts after reset : a. blower simply creases. b. there is an attempt to start the heating unit (I hear the high pitch noises), then everything stops. c. there is an attempt to start the heating unit (I hear the high pitch noises), once I see the orange glow from the coil, normally the gas is lit up and the unit starts working.