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Thanks for all the help everyone. In the end the issue was the vacuum switch in the power vent. The switch was working just fine, but the hose running from the stack to the switch was cracked and leaking. Replaced and all is working fine. No error code because the power vent is an add-on...

Paul, I'll have a go at cleaning the heat exchanger. Can you give me some insight on the procedure? Adam

The power vent is operating correctly and I've confirmed no obstructions in the stack. I just removed the power vent and checked the heat exchanger it does not seem to be overly sooted. I've attached a photo. I also tested the vacuum switch inside the power vent and it is functional. To...

Thanks for the feedback guys. There are three identical heaters sitting next to this one all functioning properly and there 3000L of gas in the tank. Since my last post I have tried the following: - Swapped pilot assembly with a working unit - Swapped control board with a functioning unit -...

406a

I have a Raypak 400kbtu propane heater acting up. When I turn it on it calls for heat and the burner fires normally, after a few seconds, the flame goes out briefly then comes back on for a second or two. The heater continues in this fashion. No error code is given. I have replaced the gas...