Water heater not firing up

if pilot replace pilot generator if ignitor replace

My G20 hot water unit is not giving out hot water it’s been like this for a few days. There doesn’t seem to be a flame lit

Tankless?... call service technician

Tank? clean arrestor screen, replace gas valve thermostat
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

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Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

I would question the Thermo couple. It pretty much runs the whole show. Inexpensive quick fix. It's the small tubing that is connected to the gas valve. The other end is a bulb that sits over the pilot flame.. Remove the old and match it up at the hardware store. Install new coupler ensuring bulb is directly over the pilot flame Common iten. The thermocoupler alks to the gas valve. If the pilot flame extinguishes (goes out) the bulb cools and shuts down the gas valve so the pilot gas feed doesn't permit raw gas to accumulate, avoiding the need emergency Services. . You will not get the heater to fire until the bulb is good and hot. The red push button ,when depressed will allow the pilot flame to be lit. Hold it down until the heater fires, indicating the T-coupler has reached its operating temp.Good Luck-Ned

Clean the flame sensor.its probably sooty its in the area of the burner it will have a semi stiff wire or 2 wires..

To avoid having a flame in the absence of water flow, the device you mentioned, 'diaphragm,' detects if adequate water is flowing to avoid a dangerous condition. Check on the housing of it for an adjustment screw; it may have a dot of sealant on it since these normally can be adjusted. It sounds as if it is misjudging the quantity of water flowing through and causing the annoying cycling.

Check fan sensor

Check thermocouple , sounds like it's not sensing flame.

You likely have a flame sensor problem.

If you can wath the ignition proccess, see if you ever notice a flame. If yes, and it then shuts downm, you have a flame sensor failure, replace the sensor and clean the flame burners and orifices.

If no flame at all, then your ignitor is failing, or you are not gatting gas to the ignitor.

does the fan come on? this has to happen before it will even try to start if it doesn't your problem goes farther into the unit,, normal pracess if the fan then the ignitor then the flame, It could be in the circuit board most people that have gone with the tankless don't clearly ask the question but that is normal, but if you could clearify the procedure of what it is doing to this point i could be more helpful to you---- e-mail me what is happeing diffrent then what it use to do [email protected]