Reznor F100 can't get pilot to stay lit.
#1
Reznor F100 can't get pilot to stay lit.
A long story as short as possible. I have a Reznor F100 ser# ANK31k5n65696 manufactured Nov. 1988. Since that time it may have run 90 days. The pilot light will not stay lit. The thermocouple has been replaced 2 or 3 times, the thermostat wiring has been replaced, I have jumpered the thermostat wires to test, I have replaced the gas valve and the pilot assembly. The pilot will not stay lit after holding the red button in for a slow count of 60. I have checked and there is 120v into furnace. I have tried to test transformer but not sure how to do that. I have pulled the three sensors so that they can be tested (once I know how) One sensor goes to the fan. One goes to the gas valve near where the pilot gas line is. The third interrupts the black wire that goes to the gas valve where the thermocouple screws into the valve. Now what!
#2
You have a power source when the thermocouple is engulfed by the pilot burner --- the thermocouple itself.
And you have a magnet that is energized by the thermocouple on the gas valve. When you push in on the gas valve, you are pushing a piece of steel into that magnetic field, and the magnetic force created by the electron flow from the thermocouple to the magnet holds the gas valve open until the pilot burner goes out and the thermocouple quits generating power. Then the valve allowing gas to flow to the main burner and pilot burner snaps shut, turning off the gas.
Since you've changed out many of the critical parts already, the likely problem is the limit switch in series with the wires from the thermocouple.
So more than likely that limit switch is making a poor electrical connection. You can test that by cutting the wires to it and wire nutting the wires to the thermocouple together. You will probably find that it's now easy to keep the pilot lit.
Presuming that's the case, you need to reconnect the wires to the poor limit switch until you get a new one. Don't just eliminate limit switches, they tend to be important safety devices.
#3
SeattlePioneer - Good news and bad news! You were correct, I skipped the involvement of the transformer and plugged the sensor straight to the thermocouple and presto the pilot stayed lit. I then turned the furnace to "on" and the thermostat up to make sure everything else is working correctly -- and nothing happened.
#5
I can see why you do not understand.......... I did not do what you had suggested. Starting all over.... I jumpered the thermocouple wires together and the pilot lit and stayed lit. I then turned up the heat to test the furnace and nothing happened.
#6
I seem to recall that we were dealing with this issue in an earlier thread. As I recall, you needed to test to see if you were getting 24 VAC from the secondary of the transformer. How is that working out?
Usually you'll have 120 VAC across the two primary wires to the transformer and you should have 24 VAC across the two secondary wires.
Seattle Pioneer
Usually you'll have 120 VAC across the two primary wires to the transformer and you should have 24 VAC across the two secondary wires.
Seattle Pioneer
#7
[QUOTE=SeattlePioneer;1514539]I seem to recall that we were dealing with this issue in an earlier thread. As I recall, you needed to test to see if you were getting 24 VAC from the secondary of the transformer. How is that working out?
I reread your thread with "robs10" before I started this thread. I pulled out my "Fluke digital multimeter" and tested the transformer and got 123v on the input side and 08.0 mv ac on the other 2 wires on the transformer. I am being very specific because once I go past the tester that has 2 wires and a light bulb I'm in way over my head. I checked for continuity on the transformer. On the output side it has continuity and read 2.3 ohms, Input side did not have continuity and produced no reading. I did not mention this sooner because I was not sure I was testing correctly. Terry
I reread your thread with "robs10" before I started this thread. I pulled out my "Fluke digital multimeter" and tested the transformer and got 123v on the input side and 08.0 mv ac on the other 2 wires on the transformer. I am being very specific because once I go past the tester that has 2 wires and a light bulb I'm in way over my head. I checked for continuity on the transformer. On the output side it has continuity and read 2.3 ohms, Input side did not have continuity and produced no reading. I did not mention this sooner because I was not sure I was testing correctly. Terry
#8
Sounds like the transformer is burned out. But then there'd the issue of what might have caused it to burn out, such as a short circuit in the thermostat wire.
You should have a repairman make these repairs, tinkerer. You really need a greater depth of understanding to undertake repairs on your equipment.
But perhaps identifying where the problem was with the thermocouple circuit and transformer will prove to make getting repairs done better and less expensive.
You should have a repairman make these repairs, tinkerer. You really need a greater depth of understanding to undertake repairs on your equipment.
But perhaps identifying where the problem was with the thermocouple circuit and transformer will prove to make getting repairs done better and less expensive.
#9
[QUOTE=SeattlePioneer;1514775]Sounds like the transformer is burned out. But then there'd the issue of what might have caused it to burn out, such as a short circuit in the thermostat wire.
You should have a repairman make these repairs, tinkerer. You really need a greater depth of understanding to undertake repairs on your equipment.
Well SP, a "Lack of Depth" has never stopped me before, I have however run aground a few times. SP, at this point I have already spent more than I should have just buying the gas valve and assembly, even at wholesale. So a repairman at 50-75 dollars plus retail parts is not in the cards, things are a little thin this year. Besides, the Reznor only heats the garage.
I understand your hesitation to help further, but if you would at least answer one last thing, I have already replaced the the thermostat wire, what else could short out the transformer? Terry
You should have a repairman make these repairs, tinkerer. You really need a greater depth of understanding to undertake repairs on your equipment.
Well SP, a "Lack of Depth" has never stopped me before, I have however run aground a few times. SP, at this point I have already spent more than I should have just buying the gas valve and assembly, even at wholesale. So a repairman at 50-75 dollars plus retail parts is not in the cards, things are a little thin this year. Besides, the Reznor only heats the garage.
I understand your hesitation to help further, but if you would at least answer one last thing, I have already replaced the the thermostat wire, what else could short out the transformer? Terry
#10
Replacing a gas valve you probably didn't need doesn't sound like a bargain.
And a lack of understanding of what you are doing can be not just expensive, it can be hazardous and even deadly.
Frankly I don't want you or your heirs filing lawsuits against me because I gave advice to you which caused injuries, property damage or death. And I don't want to be responsible for those injuries or property damage either.
Sorry I can't help you further.
And a lack of understanding of what you are doing can be not just expensive, it can be hazardous and even deadly.
Frankly I don't want you or your heirs filing lawsuits against me because I gave advice to you which caused injuries, property damage or death. And I don't want to be responsible for those injuries or property damage either.
Sorry I can't help you further.
#11
"Replacing a gas valve you probably didn't need doesn't sound like a bargain." You can say that again!!!!
I assumed that was where you were headed. I'll replace the transformer and see what happens. Hopefully it was the wiring I already replaced.
Thanks for all your help! Once I get it working I'll let you know what else I had to do. By the way, if I blow-up the garage the wife will just shake her head, again.
Respectfully,
Terry
I assumed that was where you were headed. I'll replace the transformer and see what happens. Hopefully it was the wiring I already replaced.
Thanks for all your help! Once I get it working I'll let you know what else I had to do. By the way, if I blow-up the garage the wife will just shake her head, again.
Respectfully,
Terry
#12
Could you replace the old gas valve and install the new transformer? Transformers at times don't need a definitive reason for dying. The reason I suggest replacing old gas valve , It may be a combination valve which has a regulator. It probably is set for the correct pressure (maybe) and you would need to set the pressure for the new valve.
#13
"mbk3; "Could you replace the old gas valve and install the new transformer? "
I can put the old one back, but it is a real pain. Since the furnace was installed a six foot chest freezer took up home under it. (10 ft ceiling)
"The reason I suggest replacing old gas valve , It may be a combination valve which has a regulator. It probably is set for the correct pressure (maybe) and you would need to set the pressure for the new valve."
The new valve "looks" very basic.
Original valve No., V8200M7003, Natural; Mfg., M/H;
pipe size, 1/2; Part No., 96299;
Functional replacement, code- 9B P/N- 208920
If you still think I should replace it, I will !
Transformers at times don't need a definitive reason for dying.
THANK YOU -THANK YOU mbk3 I and have known for years I am not the sharpest pencil in the box, but I'm not a crayon. I respect SP's position, but I regret giving him the impression I was a crayon.
In researching a new transformer in Reznors part cat. at:
http://www.rezspec.com%2Fcms_downloa...ggRo9bcekxPDOQ
page 19, They reference "F 25-400 Single-Stage, March-Lit Pilot" or a "f 75-400 Two-Stage, Match-Lit Pilot" model transformers. since the part number on the existing transformer - Reznor 96346-class 2 60hz, tei2i224-b11, pri bk-yw120v, sec 25v 12va, does not match any of the choices, am I correct in picking the "single stage, match-lit described as: 115 1 60,12va, Basler #BE141615-RAD ?
As I see it, there are only three parts left to buy(All on page 18), the ECO device that goes to the valve near the pilot gas supply, - replacement part #82414; limit control, auto reset - replacement part #45602; and fan control assembly - replacement part #123976(the old numbers don't match, it says 150-35f)
Is there a way to test these 3 items so I can make one order? I built a scaffolding over the freezer to get to the control side of furnace(to old, to fat, to ridged to hang sideways from ladder) I am in the better half's way.
Thanks Terry
I can put the old one back, but it is a real pain. Since the furnace was installed a six foot chest freezer took up home under it. (10 ft ceiling)
"The reason I suggest replacing old gas valve , It may be a combination valve which has a regulator. It probably is set for the correct pressure (maybe) and you would need to set the pressure for the new valve."
The new valve "looks" very basic.
Original valve No., V8200M7003, Natural; Mfg., M/H;
pipe size, 1/2; Part No., 96299;
Functional replacement, code- 9B P/N- 208920
If you still think I should replace it, I will !
Transformers at times don't need a definitive reason for dying.
THANK YOU -THANK YOU mbk3 I and have known for years I am not the sharpest pencil in the box, but I'm not a crayon. I respect SP's position, but I regret giving him the impression I was a crayon.
In researching a new transformer in Reznors part cat. at:
http://www.rezspec.com%2Fcms_downloa...ggRo9bcekxPDOQ
page 19, They reference "F 25-400 Single-Stage, March-Lit Pilot" or a "f 75-400 Two-Stage, Match-Lit Pilot" model transformers. since the part number on the existing transformer - Reznor 96346-class 2 60hz, tei2i224-b11, pri bk-yw120v, sec 25v 12va, does not match any of the choices, am I correct in picking the "single stage, match-lit described as: 115 1 60,12va, Basler #BE141615-RAD ?
As I see it, there are only three parts left to buy(All on page 18), the ECO device that goes to the valve near the pilot gas supply, - replacement part #82414; limit control, auto reset - replacement part #45602; and fan control assembly - replacement part #123976(the old numbers don't match, it says 150-35f)
Is there a way to test these 3 items so I can make one order? I built a scaffolding over the freezer to get to the control side of furnace(to old, to fat, to ridged to hang sideways from ladder) I am in the better half's way.
Thanks Terry