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if its the original model number without an b at the end it is supposed to shut off, if it is the 4604b the added a feature to keep the fan running anytime power was on to keep it from burning up the power strip, this was a temporary fix, i just picked up a new on tonight under warranty and it has a feature that lets the fan run for a while and then shut off, the newest model number is HA24-50m, is is the same heater as original but now only has 5000w and 3000w options on switch, good luck finding a listing but this is the heater northern tools gives you when they replace the 4604. im pretty computer savvy and i can not find any site that is for profusion heaters as a company, here is a number for tech support you can call, 1-866-206-0888
It may be getting too hot and activating the safety shut off. This may need a new board. I have never worked on one of these but it has to be fixable. Depending on the cost of the unit as to whether or not it is worth it.
From the Troubleshooting Guide -
Check the Obvious
Turn on the gas and listen at the burner to see if you can hear the gas arriving.
If the patio heater has an electronic ignition system make sure that there is a spark. If there is a spark but the heater will not light up, try using a lighter or burning spill to light the gas. Be ready for a flash over if you have been trying to light the gas for a while-there might be a small cloud of gas near the burner.
Start at the Bottom
The most likely reason that a gas heater will not work is that there is no gas. Take out the empty gas cylinder and replace it with a full one. Often you will feel that there is still gas in an empty cylinder but there is not enough to create the pressure needed to drive the gas burner. An empty cylinder will feel light.
Check the Gas Regulator
The gas regulator is the connection of the gas cylinder to the gas pipe that takes the gas up to the burner. Some regulators have a flip switch that prevents the valve in the top of the cylinder from being depressed-effectively an "off" switch. If there is such a switch, make sure that it is in the "on" position.
Check the Gas Pipe
Although it is most unlikely that the gas pipe can get blocked, remove the gas pipe from the regulator and from the gas inlet at the top of the heater. This pipe is pressure fitted and held in place by pipe clips. Blow air through the pipe to ensure that it is clear.
Check the Burner
The burner will be a very simple assembly. Take each part off in turn and check for any blockages. Also check that the burner apertures are set correctly. Beneath each burner is a small chamber in which air and gas are mixed. Make sure that the gas and air inlets are clear.
If Your Heater has a Pilot Light
If your heater has a pilot light, there is the possibility that the thermo couple has failed. The thermo couple is usually shaped like an inverted "v" and sits in the flame of the pilot light. The temperature acts on the thermocouple to keep the gas supply to the burner open. A good indication that the thermocouple has broken down is that the pilot light goes out when you try to turn the heater on. Thermo couples are readily available patio heater parts and usually available from stock.
If you have carried out all the checks and the heater will still not light, you can repeat all the checks more slowly and carefully or take your heater to a specialist for a service.
Replaced 301 80C 16A thermostat, purchased on ebay for $6.00, fixed problem. to Fix standing at front, Remove left side panel, two small screws hold thermostat in place. LifeSmart wants $36.00 for same part. Fixed problem.
Remove power for some time and switch on after few hours , this might reset any error on the processor , if not the error could be due to fault indication of a failure within the heater, could be the infra or the element.