Question about Procom QL300TYLA Heater

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Doesn't turn off

Everything works great except the heater won't ever turn off when the thermostat is set at the lowest postion. I have to manually turn the heater to pilot cuz it's cooking me out!

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Only three options here first check for shorted wires , second bad thermostat (try unplugging thermostat wires one at a time if possible to see if unit turns off, this will also tell you if the gas valve is stuck open if you take all the wires off the thermostat and the thing still reuns, ) good luck.

Posted on Mar 30, 2008

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There are flaps called blend doors, they can be ether electronic or manual ( cable operated) and sometimes vacuum, they are the ones responsible for making the HV/AC blow cold or hot air. Just go under dash and adjust the temperature cold/hot and listen carefully for the blend door to move and or an actuator to close or open.. Best thing is just to take out actuator and adjust it manually...
And you probably have a bad thermostat thats why the truck wont reach operating temperature. Previous owner may have taken it out to try to hide and overheating problem. Good luck ??

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I am not familiar with this particular thermostat; however, here's some general information; I hope this solution will help you troubleshoot.
Multiple Thermostats set in 1 zone will conflict; the one with the lowest setting will be the determining Thermostat. Here's an option you can try yourself; my solution is 'hard reset' the thermostat - afterwards, i'm outta options. invest in external thermometer battery/natural types; & manually turn t-stat ON or OFF; Additionally, keep an eye on how much draw your AC is doing on your meter.

setOFF manual; however do NOT change settings or power-off t-stat. I'd keep it on what you had intended it from day1. However, some may debate to turn everything off beforehand. personally, myself, poweringOFF the switch connected to your t-stat works. Remove battery and reinsert inverted; wait (5sec-1min); remove; wait 1min ('debatable' timeframe 5sec - 1min); reinsert batteries correctly; if you have a programmable thermostat; do the same with the hit 'reset filter' held down & wait 5-sec1min; observe roomTemp reading. May I suggest to keep an extra thermometer around to determine if temperature reading from the thermostat correct? Friendly reminder to turnOFF 'auto' mode during this hard reset. If reset requires reprogramming your t-stat, do whatever required to set your desired setting. cheers. best of luck.

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1 Answer

Trouble shooting codes


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I am not familiar with this particular thermostat; however, here's some general t-stat information; I hope this solution will help you troubleshoot.

Multiple Thermostats set in 1 zone will conflict; the one with the lowest setting will be the determining Thermostat for the group. Here's an option you can try yourself; my solution is 'hard reset' the thermostat - afterwards, i'm outta options. invest in external thermometer battery/natural types; & manually turn t-stat ON or OFF; Additionally, keep an eye on how much draw your AC is doing on your meter.

disable auto & enable manual; however do NOT change settings or power-off t-stat. I'd keep it on what you had intended it from day1. However, some may debate to turn everything off beforehand. personally, myself, poweringOFF the switch connected to your t-stat works. Remove battery and reinsert inverted; wait (5sec-1min); remove; wait 1min ('debatable' timeframe 5sec - 1min); reinsert batteries correctly; if you have a programmable thermostat; do the same with the hit 'reset filter' held down & wait 5-sec1min; observe roomTemp reading. May I suggest to keep an extra thermometer around to determine if temperature reading from the thermostat correct? Friendly reminder to turnOFF 'auto' mode during this hard reset. If reset requires reprogramming your t-stat, do whatever required to set your desired setting. cheers. best of luck.

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I have a customer who has a Warm Morning direct vent propane heater: model DV.203 AMA. His complaint is the thermostat does not seem to work properly. The dial is turned to the lowest setting and it...


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1 Answer

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Your heater uses a capillary bulb type thermostat sensor. If the small copper tubing that runs from the copper bulb to the control valve ls bent or crimped, it won't work properly or at all. Try setting the temperature at the lowest level, so that the room heats up gradually. Then, see if the Thermostat shuts it off. Also check the air intake on the front of the heater to make sure it's not obstructed or clogged in any way. If all else fails, contact Empire Comfort Systems Technical Service Dept @ 800-851-9396.

Hope this helps you troubleshoot and solve the problem.

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Refridgerator is freezing everything


This is likely a thermostat failure. The thermostat is no longer shutting down the compressor or sensing the temperature wrong. The thermostat is a module inside most modern refrigerators and is a fairly easy fix except for the cramped quarters. You can order the thermostat from an appliance repair store. I suggest getting the service manual while you are at it if you have no experience taking a fridge apart.
Do not damage or bend the sensing tube sharply at any time. Be gentle!

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The refridgerator side is freezing everything.I have turned the knob to the lowest setting and everything is still freezing. what is the problem?


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1 Answer

How do you vent thermostat on 325E (1985)? I replaced my upper radiator hose and I have a feeling thermostat will not open. Thanks for input on this matter.


There should be 2 bleeder screws in the system, one on the expansion tank, and one on a thermostat housing. Open both screws all the way. Turn the key to the On postion (but dont start the car). Then turn the heater to max heat, but have the fan set at the lowest setting. Fill the expansion tank til coolant comes out of both bleeder screws with no bubbles. After that close the screws (be very careful not to over tighten them!!). Then completly fill the expansion tank. (dont mind the full mark, if theres air in the system, it will drop the level in the expansion tank) And thats it. Drive the car around then check the level.

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