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The SPK Code, indicates that there is power to Igniter and should be producing a Spark to ignite fuel! If this is actually the case, then it is NOT a safety sensor issue, The igniter serves a dual purpose: produce a spark, and then CONFIRM a flame is consuming the fuel. If it does not get a proper Milivolt reading, then gas valve will shut off, hence a cycle occurs. Not enough reading is the same to the heater as no reading! Safety issue. If gas valve stays open, and no flame to consume raw fuel, it will build up and accumulate then when ignition takes place, it go...BOOM! Not Good.
Either insufficient fuel supply/pressure or faulty igniter. It's also not a Gas Valve. It's a simple switching valve, either open or closed.
The CFH is a Call For Heat.
The SPK tells you that it is creating a spark for ignition.
The LO tells me that you are on propane.
The fact that it doesnt light tells me that either the ignitor is not sparking, or that there is no gas, or an incorrect gas supply.
If this unit is installed with flexible gas line, replace this with rigid black pipe or a larger flex line.
CFH means "Call For Heat", and SPK is "Spark". It sounds like you are running out of gas.Propane tanks need to have 30% in the tank for a heater to run correctly,and after they are filled you must bleed the air out of the line.If you have Natural gas,the gas line may be too small to supply enough gas to keep it running. NOTE...gas pressure MUST be checked with the heater running.
You can try pulling your pilot assembly out and clean it. Sometimes it will get sooted up and cause the sensor to short so the heater get's a falce reading and shuts the heater down. Then sometimes the heater will start and sometimes it won't. If this dosen't help check the ignition wire for any cracks or anyplace it may be shorting. Good luck.