20 Most Recent
Procom ML300HGA Heater Questions & Answers
Pilot Lught
when you light the pilot you hold down the knob for the coupler to get hot at this time don't let go of the knob turn it to on position as quickly as you can. If that doesn't fix it you need to replace the thermal coupler. try that
Runs an shuts off
So we are talking about the same won't stay lit I will describe both ways. One is when you lift your fingers off the knob it goes out that instant which is probably the thermocouple needs replaced,look to make sure the tip of the thermocouple is in the flame of the pilot light first. The secound version of it is it goes out in a few minutes up to a few hours.The second version is most common.There is a part called a Thermocouple that is mounted next to the pilot light, it is around 3/16 of a inch diameter 1 to 2 inches long and should be mounted so the tip is in the flame of the pilot light. This is what tells the gas valve the pilot light is burning. If any dust ,cat hair ,dog fur what have you gets around the base of the hole the gas from this pilot light comes out of it will bend the gas, which move the flame so it does not hit the thermocouple like it should, this is below the flame so what ever is in there diverting the flame dose not burn up.A draft from a fan or door could do it also.I have used a procom ventless heater as my only heat for 7 years and have to blow it out twice a year. I bought a new thermocouple at the same time I bought the heater to have in the closet in case it went bad some night, it is still hanging there .Because it sucks air in from the bottom past the flame and out the top everything in the air gets burnt into a fine ash dust. So if you use compressed air to blow out your unit you might want to hold a wet towel up in front of it hoping a lot of that white powder dust will stick to it instead of flying around the room . My flame always looks so much better ,less orange and more blue after this .
Adjusting thermo couple into flame on Pro-Com
You can't adjust the Thermocouple into the flame. But, you can clean the pilot assembly, so that the pilot flame doesn't curl (curve upward away from the thermocouple).
Turn off the heater:
Use canned compressed air with a straw nozzle (like you clean your computer with). Place the tip of the straw nozzle into the pilot tip and give it a quick shot of air. Look down the pilot from the tip and about 2/3rds of the way down, you'll see a whole in the side of the pilot. That's the ODS Sensor. Place the tip of the straw nozzle just barely into that hole and give it a quick blast of air. You'll probably see debris blow out the other side. Light the pilot, but not the burner. Is the pilot flame straight and now touching the thermocouple? If not, re-clean the pilot assembly.
That should solve your problem.
After the pilot is on,
It sounds like the Oxygen Depletion Sensor (ODS) is clogged with dust, lint and/or pet hair. Or the Thermocouple has gone bad. But, I'm betting on the ODS being clogged.
What you'll need: 1. Phillips Head Screw Driver. 2. Canned Compressed Air with a straw nozzle (Like you clean your computer with). 3. A vacuum that has a hose and brush attachmnet.
First, turn of the gas to the heater. Dismantle/Remove the front of the heater cabinet. Should be 4 to six sheet metal screws holding it together on the 4 outer edges of the heater.
Once the front is removed you will have access to everything. You will probably find a lot of dust and lint in the heater cabinet. Using the vacuum with the hose and brush attachment clean all of the interior (including the burner) that you can safely reach with vacuum. When that's completed, look at the Pilot Assembly, Take the canned compressed air with the straw nozzle and blow out the tip of the pilot with a quick shot of air. Then look down the pilot and you should see a small hole in the side of the pilot. That's the ODS sensor. Place the tip of the straw nozzle just barely into the hole and give it a quick shot of air. That will blow any debris out the other side.
While the cabinet front is still off, turn the gas back on and try lighting the pilot. When it lights, hold the control knob down for one minute. Ease off the knob and if the pilot stay lit, let it burn for a minute before turning it to the ON position. The burner should light and say lit. If it does, don't leave it burning long, no more than a minute or two. Turn the whole thing off and reassemble the cabinet and you're ready to go.
If all that worked, pat yourself on the back, because you just completed what's called "Annual Maintenance". Which you should do every year in the Fall before you light the heater for the heating season.
If that didn't work, still pat yourself on the back, because now you know the Thermocouple needs to be replaced . You can purchase that directly from ProCom.
Hope this helped you get back up and burning. Please let me know.
Turns itself off
If the pilot is turning off too, it's an indication that the Oxygen Depletion Sensor (ODS) may be clogged with dust, lint or pet hair. This happens because your Vent-free gas heater uses interior air for combustion and whatever s floating in your household air during operation is going into the heater and clogging it up.
If you still have your Owners Manual, follow the instructions for removing the front half of the cabinet, Be sure the control knob on the top is in the Off position, before removing the front half of the cabinet.
Here's what you'll need to clean the interior and it's parts: A vacuum cleaner that has a hose and brush attachment, a can of compressed air with a straw nozzle (like you clean your computer with).
Once the front has been removed, vacuum all of the interior, as well as the burner, that you can gently reach with the brush attachment. Once vacuuming is complete, look at the pilot assembly (it will be next to the burner). With the can of compressed air with the straw nozzle attached, place the tip of the straw nozzle barely into the pilot opening (were the pilot flame comes out and give it a quick blast of air. Now, look down the pilot from where the flame come out and you should see a small hole in the side or top of the pilot. That's the ODS sensor. Place the straw nozzle tip just barely into that hole and give it a quick blast of air. That should blowout any debris that's clogging it.
Now, look for the Thermocouple. It will be either a stand a lone thermocouple (A thin brass rod in front of the pilot flame opening. Or wire soldered to the side of the pilot near the pilot flame tip). Trace that wire back to the control valve at the top of the heater cabinet. It's a attached to the control valve with a compression nut. Try loosening it with your fingers. If you can turn it with your fingers, it needs to be retightened with your fingers and with the appropriately sized open end wrench tighten only a quarter (1/4) turn more.
Reassemble the heater and try lighting it as you normally would. If the pilot lights and holds, wait one minute before turning it to the on position. If everything works as designed, what you just performed solved the problem. Remember to do the servicing and cleaning annually. Usually in the Fall before firing it up for the heating season.
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