I replaced the thermopile but the pilot still doesn't remain lit. What would you recomend doing next?

The system I am familiar with uses a vapour pressure type thermocouple and if the pilot remains lit the thermocouple is working as it controls the gas for the pilot and the burner at the same time from the same source - if the gas control is ok and the flow isn't prevented by the thermostat then if the pilot remains alight, there should be a flow of gas and the burner should light - unless the gas jet is blocked or something else, some other type of blockage is preventing the flow of gas to the burner...

I suggest you check the gas jet and the flow of gas to it...

Are you talking about the thermocouple or thermopile

Not thermopile. If your pilot will not remain lit, you need a thermo-couple. This is the device that allows the pilot to remain lit.
If you can't even get it lit, you will need to check if there is blockage preventing gas from coming out of the pilot orifice.

First clean out pilot light with can of air , or blow down it with a tude.
Then brush electrode clean with a clean paint brush ,chech to see if electrode is in the right postion to light the gas not too far away and the spark is strong , Clean thermopile head if fitted, then check thermocuople /thermopile connections are tight . see if this helps .

Part of the problem may be, that when you turn the control knob to ignition, you're not holding it in long enough for Thermocouple or Thermopile to thoroughly heat up after the pilot lights. You should hold the bottom down for 30 seconds to a minute, to allow it to heat up. Then, when you slowly release it. If the pilot remains lit, turn the knob to the desire position.

If the above doesn't solve the problem, the Thermocouple or Thermopile (aka Pilot Generator) will need to be replaced.

Hope this helped you. Cheers

While holding down the control knob for the pilot, you either have to use the pilot ignitor or match light the pilot. Then old the knob in for 60 seconds, before releasing it. If the pilot remains lit, turn the control knob to ON. If the pilot does not remain lit, the Thermocouple or Thermopile may need to be replaced.

Hope this helps you to solve the problem.

Check if the the gas pressure is sufficient (as stated on unit's nameplate). Check if the hi limit device is good. Check also if the thermopile (cylindrical metal with two wires standing behind the pilot hood) is receiving enough heat from the pilot flame. The voltage generated by thermopile should be 500millivolts in order to open pilot and main valve. If there is 500millivolt on gas valve thermopile and the pilot flame does not stay lit, you have to replace the gas valve. If the thermopile is glowing red and the voltage generated does not reach 500 millivots, you have to replace the thermopile.

check that you have thermopile connections are right at valve and that the flame is hitting both thermopile and thermocouple good. pilot falme may be blue but is it strong? a strong pilot has flame completely hitting both safety's. if pilot is small check pilot orifice inside pilot hood, a quick fix which may work is put vacuum over pilot hood and **** out any dust in there, just be gentle...

If the thermocouple is being well covered by the pilot flame, then it sounds like the thermocouple or thermopile is bad (a thermocouple and thermopile both perform the same way, but are entirely different devices. I am unsure which yours has.
Also, make sure all connections from the t-couple of generator are snug tight to the gas valve. There may also be a temperature sensor that has tripped that prevents the pilot from remaining lit. Follow the thermocouple/thermopile tubing to locate any inline sensors that may be open, preventing the signal reaching the gas valve.

Let me know if I can help more. I have not been able to find any information on this specific unit, so will have to speak in general about what to look for.

if you changed the thermopile and still have the same problem make sure that the sensing bulb is directly over the flame. If it is and the thermopile is installed correctly the next thing would be the gas valve.

Hope this helps