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First locate the water solenoid valve. Disconnect the water line to the inlet side of the valve to make sure water is getting to the valve. Once that's verified, disconnect the outlet side of the valve. Activate the steam and verify that the valve opens and there's a good amount of water coming out of the valve. If no water comes out. Verify that the coil is getting energized with the correct voltage. If the correct voltage is present and you have no water coming out. Replace the solenoid. If everything is working then remove the left panel inside the oven to check for blockage in the steam manifold. The manifold consists of a pipe with several spray nozzles that spray water on rebar. Remove all the nozzles and activate the steam. Do this several times to purge any rust or debri. Clean the nozzles and replace them. You should be good to go.
F3 usually means a failed sensor. This is the part that is a small rod about 6 inches or so long usually in the left upper rear corner of the oven. To check this sensor using an ohm meter with the oven at room temp you should get a reading of 1100 ohms.
It may also be possible that you could have a cold solder joint on the control board or bad / burned wire.
Behind the oven controls face plate (located on the side inside wall) - there is usually a mini service manual that may give you more information specific to your model.
Build up of grease, dirt, rust, mineral deposits, etc can cause improper gas flow resulting in a delayed ignition. That causes a build up of gas and the delayed ignition ignites it all at once, and you have your WHOOMP mini explosion.
Sounds like you have a water leak! The right side panel needs to come off. Here you will see your copper water lines. Try steaming while watching to see where the water is coming from, most likely its coming from the two spray nozzles that enter the oven near the top in the front and rear. If the leak isn't obvious have an authorized technician service the oven. A leak in this part of the oven left unattended could cause more damage and potentially a fire.
Sounds like the igniter is not operating at full capacity. What happens is that the oven does not light when it should. Instead, the oven is cooling down much too far so when the oven does light it has too heat more rapidly. This causes the outside to brown/burn long before it should.