weil mclaine gv 4 gold gas boiler won't fire

Empire_2

I know you did everything 3 x, but what is the manifold pressure on the gas valve, and what is the D/C flame rectification reading with your Micro-Amp meter?

Mike T.

Eric_30

weil mclaine gv 4 gold won't fire

Weil mclain gv 4 Gold propane boiler refuses to fire.

The boiler will cycle thru the purge, ingnitor,valve and will not go to flame though the flame diode flickers very low for a second. It does this 3 times than stops cycling and the valve lite blinks on and off.
We have tried and done the folling:
1 replaced the ignitor
2 replaced the valve
3 replaced the control board
4 cleaned the cone inside the boiler. When we did this we found 2 bugs cloging the very tip of the cone. Cleaned them out put it back together and it fired up. At the time we had a new valve on. We thought we had solved the problem so we put the old valve back on. Didn't fire, went thru the same sequence. So we put the new valve back on and it still did not fire. We have at this point tried 2 different new valves.
5 replaced the harness when we replaced the valve
6 checked the gas pressure to the valve (13 lbs)
7 checked the voltage to the valve (26 on the volt meter)
We have done all of the above at least 3 times each and it still does what I first described.
Needless to say at this point I'm going out of my brain.
Any and all help would be apperciated!!!!!!!!!!






















0

Eric_30

weil mclaine gv 4 gold won't fire

Weil mclain gv 4 Gold propane boiler refuses to fire.

The boiler will cycle thru the purge, ingnitor,valve and will not go to flame though the flame diode flickers very low for a second. It does this 3 times than stops cycling and the valve lite blinks on and off.
We have tried and done the folling:
1. replaced the ignitor
2. replaced the valve
3. replaced the control board
4. cleaned the cone inside the boiler. When we did this we found 2 bugs cloging the very tip of the cone. Cleaned them out put it back together and it fired up. At the time we had a new valve on. We thought we had solved the problem so we put the old valve back on. Didn't fire, went thru the same sequence. So we put the new valve back on and it still did not fire. We cleaned the cone a second time and took the shop vac to the air intake pipe. Stii didn't fire. We have at this point tried 2 different new valves.
5. replaced the harness when we replaced the valve
6. checked the gas pressure to the valve (13 lbs)
7. checked the voltage to the valve (26 on the volt meter).
We have done all of the above at least 3 times each and it still does what I first described.
Needless to say at this point I'm going out of my brain.
Any and all help would be apperciated!!!!!!!!!!

Thanks,

Eric






















0

Dirty

Check the pressure differance accross heat exchange if lower than 1.6"w.c. it cold be plugged

tim smith

GV boiler

Pull the flue pipe off and look closeley into the discharge elbow, also disconnect condensate drain and see if there is alot of particulate in there. We have found that on 7-10 yr old boilers, the heat exchanger builds up with scale etc and we have had to pull heat exchanger and separate and clean out, then reassemble with new gaskets if available. Tough all day job but has cured a couple boilers that had air flow problems through them. Good luck, Tim.

Empire_2

Very good points guy's

In today's technology, replacing parts just, will not work. It's best to understand what is happening and WHY....;-) Invest in a diff. pressure meter. It can make your job easier.

Mike T.

Dale

yatzee method

If you really have 13 pounds of gas pressure to this boiler you have big problems, the utility regulator is bad, call the gas supplier. If it's really 13" water column or a little less than 1/2 pound then it's a little high but OK, in the future the key to gas pressure is what is it when the burner is ON. It's a complex business troubleshooting any heating equipment, more so the more modern it is.

Eric_30

Problem solved!!!
Turns out it was a common house fly that was blocking the orifice where the gas enters the blower/mixer.
We removed the fly and it fired right up.
So a Lady Bug was blocking the tip of the cone in the burn chamber and then a fly in the orifice. 2 bugs shut me right down.
I know it's hard to belive but they must have come in from the outside air intake. One, the Lady Bug went to the cone the other, house fly, went to the orifice. One for the books.

I want to thank everyone who wrote with suggestions. It's nice to know I can get help in this forum.

Thanks again,

Eric