ILO stands for Ignition Lock Out.
This heater must be on a propane gas system as that is the only model that supports the ILO feature.
This either means that the gas supply is insufficient, or is turned off, OR...
the ignitor / flame rectifier have failed.
As long as you know that the pilot orifice is clean and free of debris, and the gas supply is turned on and correct, you simply need to purchase and install a new ignitor for this heater. I would normally list the part number and a place to buy it for you, but there was no model listed on this post.
On raypak heaters, the ignitor is actually the same part as the flame rectifier (flame sensor) .
What this means is that even if the ignitor portion is working, and your heater is igniting, the ILO code is telling us that the flame sensor is not sensing that it is lit. This is when it shuts down and gives the ILO code.
If you lost your manual and need a part number contact me @ :
[email protected]I have most raypak ignitors in stock if you are interested.
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