Weil-Mclain VHE will not stay running.

______________________________________________________________________ Allow me to introduce my self, my name is Ryan. With that out of the way, on to my problem. I have a Weil-McLain VHE boiler in my house, not sure of the age (was here when I bought the house). I have not had any problems in the 6 years that I have been here until last week. When the water tank is calling for hot water, the boiler will start up, on the controller the green power light is on. The red “Purge” light comes on, after that the “Ignite” light comes on, the igniter glows, gas starts, runs for 3 seconds and the light on the controller goes from “Valve/Flame” back to “Purge”. It does this 3 times (igniter,gas,nothing, etc.) then the “Valve/Flame” lights blinks. I just put in a new igniter and an air switch since this has happened. It is still not working. I can get it to run if I am lucky by pulling the terminals off the air switch, but that will only work for about 15 minutes. Is there anything else I should be looking at/for? Boiler – Weil-McLain VHE Controller – Honeywell s9301a Replies: TKG26 “Re(1):Weil-Mclain VHE will not stay running.” , posted Tue 10 Jul 08:00 ______________________________________________________________________ You have a bad or dirty flame rod. Flame rod is your flame sensor, and in a boiler application they really take abuse from the condensation and high heat in the combustion area.. This rod should be located at the oposite side of the hsi ignitor. With that said in 6 years have you had a licenced tech in to perform anual maintenance to this boiler?? Boiler need to be looked at annually to ensure they are operating properly. Dirty burners are common, dirty flue passages or plugged passages at times, Chimney and liners if not sized correctly can deteriorate much quicker with a boiler then a furnace… Things you really want looked at by a pro. Boilers have a long life but if abused can fail and cost alot more to replace then a furnace.. WE have many VHE under rental contract where i work, i have mostly run into HSI and flame rod issues. The odd cracked cast iron section and a few sooted up from bad chimneys.. SIGNATURE “Always have a licensed HVAC technician perform repairs on your equipments. HVAC is not a do-it-your-self home project.” shankun “Re(2):Weil-Mclain VHE will not stay running.” , posted Tue 10 Jul 10:19 ______________________________________________________________________ I had a tech here in October/November of 2006. On to this flame sensor. I have looked for one and have not found one, nor do I see any place for one to be wired into the controller. The only sensor that I have found is the flame roll out sensor (I think that is what it is called). As for the chimney, there is nothing blocking it. I thought this at first since it is warm out, the furnace has not been running maybe there were birds making a nest in it. But that is not the case. So if you can (or someone can) guide me in the right direction as to where this flame sensor is (or if it even has one), it would be greatly appreciated. TKG26 “Re(3):Weil-Mclain VHE will not stay running.” , posted Tue 10 Jul 11:26 ______________________________________________________________________ Ah your flame rectification must be through the HSI… There are various ignition systems used on this boiler. You said u can get it running by-passing the pressure switch, its possible your ventor motor is slowing down or had debris or dirt in it. IF its the black painted metal versions you could have paint flaking that will mess up the pressure switch sencing and not allow it to make pressure switch. Best to take a look at the ventor motor blower wheel and see how it looks. Its rare but if you have a good hsi you said new… That the ignition module could be defective to the point where its not seeing the flame signal through the hsi. Assuming clean burners and ground wires it could be the module, Check out your ventor next though SIGNATURE “Always have a licensed HVAC technician perform repairs on your equipments. HVAC is not a do-it-your-self home project.” yuri “Re(4):Weil-Mclain VHE will not stay running.” , posted Tue 10 Jul 19:47: ______________________________________________________________________ Do you have any good reference/reading material about flame sensing/rectification thru the HSI. How does it work? Very rare where I am. Is it the same system that the old Coleman mids used? Briefly how does it work. Thanks Yuri [this message was edited by yuri on Tue 10 Jul 19:48] TKG26 “Re(5):Weil-Mclain VHE will not stay running.” , posted Tue 10 Jul 22:06 ______________________________________________________________________ Yes its just like the old coleman mids and some other units. There was one unit out there that had a kit where you spliced a flame rod into the nuetral side of the HSI when there was flame sencing issues. Some Clare megajunks senced through the HSI as well. As for taking a flame signal i dont. If the resitance is off on the HSI or its white looking i change them. I though there was a way to take a signal through the ground but to be honest i dont remeber how, most of the time the HSI was the fix. OR there was a retrofit kit that gave a remote flame sence. Maybe weil has a kit, ill have to check when im at work again I can however get a flame signal off of a spark pilot from a honeywell s86 module that only has the ingitor but no sensor :) SIGNATURE “Always have a licensed HVAC technician perform repairs on your equipments. HVAC is not a do-it-your-self home project.” shankun “Re(6):Weil-Mclain VHE will not stay running.” , posted Tue 10 Jul 23:45 ______________________________________________________________________ Update* I took the fan housing apart today to check the inside for debris. It was held together with silicone that really did not serve its purpose anymore. I cleaned that all up and put air pressure to the lines. The one was ok. The other one was plugged. So, after the reassembly process (and waiting for the RTV sealant to dry), turned the power on and so far it has been running with out any problems. I really hope this fixes it. TKG26 “Re(7):Weil-Mclain VHE will not stay running.” , posted Wed 11 Jul 08:04 ______________________________________________________________________ Good stuff, i think you got it. SIGNATURE “Always have a licensed HVAC technician perform repairs on your equipments. HVAC is not a do-it-your-self home project.” yuri “Re(8):Weil-Mclain VHE will not stay running.” , posted Wed 11 Jul 18:38: ______________________________________________________________________ Thanks for the info. I usually make sure all the ground wiring and burner attachment points and module grommets are clean and grounded. The Colemans used a Fenwal board. Some Rheem/Ruud highs had this add on sensor kit but are very rare in my area. I usually check the HSI and get between 50-80 ohms if okay. Had a Coleman mid heat exchanger split really bad slightly above where the flame from the inshot burner hits the back of the chamber. Pulled the burner and it was very obvious. Yuri [this message was edited by yuri on Wed 11 Jul 18:40] shankun “Re(9):Weil-Mclain VHE will not stay running.” , posted Wed 11 Jul 23:55: ______________________________________________________________________ I guess I spoke too soon. Woke up this morning to the “Valve/Flame” light flashing again. I am going to buy a new controller tomorrow. If that does not work, guess it is time for a new boiler. Any suggestions? *new controller works great* [this message was edited by shankun on Thu 12 Jul 21:21]

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