Gas Oven Whistling noise

The horrible high pitched squeaky sound in a lincoln oven could be coming from the moving parts more so from the main fan motor positioned at the back or it could be from conveyor drive system. In both you got to dismantle the motors if at the back replace the motor bearings.

the low voltage transformer on the ERC control is vibrating from not doing anything,when you put a load on this transformer it will quit,only fix is to possibly remove ERC and jam a piece of NON-Flammable/NON-electrical metal to keep it from vibrating and try this first,if this doesn't help,replace the noisy board with this transformer on it

These types of ovens are complex to troubleshoot and repair. I would contact an appliance tech.

IF IT'S A CONVECTION OVEN, IT JUST MIGHT BE A FAN PROBLEM. THE BEARING MAY BE GONE OR SOMETHING IS LOOSE AND TOUCHING THE FAN.

Sounds like a sticking gas valve or a defective hot surface igniter. Open the broiler drawer or remove the bottom cover in the oven compartment. The oven usually has a hot surface igniter or a spark igniter. Turn on the oven and watch for the hot surface igniter to start glowing. It should glow very bright. Once it is glowing the burner gas should come on. If you hear the gas come on it should light right away. If there is any delay shut off the oven and stay back. Let the gas clear out then inspect the area near the igniter and make sure the burner is not plugged(the little holes may have debris in them). If you turn on the oven and the igniter comes,glows brightly,no gas is heard but you can smell gas it is either a blocked burner orfice/assembly or sticking gas control valve. Try giving the burner and gas control valve a tap and see if it comes on. If you tap the control valve and it starts working then shut of the oven and try it several times. If it starts to come on and off now you may have cleared whatever debris was causing the problem. If it does it again then it could be the control valve or a weak hot surface igniter. The igniter can be tested with a ohm meter. Most of the time when I get this complaint it is the oven control valve that is sticking. Be very careful when doing these procedures....gas can build up in the oven compartment very quicky and flash if ignited. Always have the gas shut off valve at the back of the range within reach and the electrical outlet in case you need to unplug it.

gas man told us that the timer was not linked with oven and this was solved by correcting the clock

this sounds like the gas solenoid valve you may need to change the coil on the solenoid valve

You have a gas leak.
Call a qualified technician quickly.

Flame saftey device control valve stuck in open position that why main gas is coming other wise flame should be max 2cm long after flame saftey device heat up and bellow expand and main valve should open

Check the voltage on the 2 wires going to the oven gas valve. If you get 120v when the ignitor is on with no gas coming out, you have a bad gas valve. If you get voltage, but it is not much, it is the ignitor. The ignitors don't burn out completely on the ovens, they just get a little dim and no longer ignite the gas and eventually will not turn on the gas valve