I have this same type of heater. Unfortunately, what little support I've tried to get for this thing, both with Toyotomi and locally, has proved to be pretty much non-existent. No one seems to have any interest at all in supporting these things any more. When mine goes out, I'll definitely be replacing it with something else.
Anyway, I went through the same thing myself a while back. I found that I had a fuel
feeding issue. Looking at the translucent fuel line, I could see fuel (or, more accurately, bubbles in the fuel after I first inserted it into the fuel tank) gradually work its way up to the heater unit after turning it on. But there wasn't enough fuel in the line initially to start it up, so it tried to light for a while then gave me the steady red light. I simply turned it off again, and restarted it. Kept doing that until solid fuel was making it to the heater, at which point it ignited and ran properly. It probably took nearly 10 times cycling it for me, being as how slowly it sucks the fuel up.