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General Humidifiermodel #45

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amana oven won't heat up to bake.

I already replaced the oven ignitor, but still won't work. I know the new ignitor works because it heats up during the self-cleaning process. Any other suggestions on what else may be the problem? It's for an amana AGR5735QDS.

Posted September 16, 2010

Answers

Alina F. , September 16, 2010

Well something that would have this kind of troubleshooting information will be in your owners manual. I know exactly how hard it is to keep track of all the owners manuals in your home but something that is very handy about Manage My Life is that you can find just about any manual on here. All you have to do is go to the top of the page and click on the tab that says "MANUALS" in the search box type in your model number then you manual will be available for you to view. I have attached the link below for you to view while waiting on your response from an expert. Hope this helps!

Joey S, September 17, 2010

I must assume when you stated that you replaced the oven ignitor that you mean you replaced the BAKE ignitor and not the BROIL igniter. If the bake ignitor glows and allows the gas valve to open during the clean cycle then there is nothing to prevent it from glowing and opening the gas valve during the bake cycle.

I added the theory of operation below.

The glow bar system is completely reliant upon electricity. When the oven control is turned on the internal bake relay closes, 120 VAC is provided to the glow bar ignitor and the gas valve circuit. The high resistances of the glow bar limits the current flow through the ignitor/gas valve. Continual current flow through the circuit causes the glow bar ignitor to glow brighter and the resistance of the ignitor decreases, which increases the current flow through the ignitor/gas valve circuit. This increases the amount of heat generated by the heater, which causes the bi-metal to bend. At a point the ignitor resistance will have increased to approximately 3.5 amps of current flow through the ignitor/gas valve circuit. In approximately 45 seconds the glow bar ignitor temperature will have increased to approximately 2650°F. the voltage drop across the gas valve terminals will have increased to about 3 VAC, which will indicate enough current to flow to provide enough bi-metal heat to cause the gas valve to open providing gas flow to the oven burner the heat from the glow bar ignites the gas. The sensing element of the oven control then cycles contacts within the oven control, opening and closing to cycle the glow bar, safety valve, and burner to maintain the desired temperature. NOTE: This system cannot operate without electricity.

The primary components of this ignition system are the electronic control, ignitor, and safety valve. These components are all wired in series and although the oven control and glow bar require 120 VAC, 60 Hz. The oven valve operates on approximately 3 volts. Therefore, 120 VAC should never be applied directly to the oven valve terminals. The glow bar is the power source for the oven valve.

amana_agr5735qds, September 17, 2010

I also check the amps of current flow through the bake ignitor. It was well over 3.5 amps. The bake function just doesn't seem to want to activate the bake igintor. Do you think it may be the controller board? Thoughts???.

Joey S, September 20, 2010

If the bake ignitor is pulling 3.5 amps this amount of amperage should be sufficient to open the oven safety valve. You would not need a control board because it's providing the voltage to the bake ignitor. The failure is either the gas is shut off to the gas valve or it has a faulty oven safety valve. Note: Make sure the gas shut off lever on the pressure regulator was not accidentally shut off. If gas is present to the oven safety valve and the bake ignitor is pulling 3.5 amps then it sounds like a faulty oven safety valve.

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