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Re: How do I access the thermocouple on my Laars Lite,...
Whoo told you it does the trick?The only trick I know that works on a thermocoupler is replacing it with a good one. It is the probe that sits in the pilot flame. If you take it out to scrub it, you may as well put a new one in its place . They are relatively inexpensive.
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make sure it is a propane heater propane burns hotter than gas if not correct heater it will overheat if ok check gas pressure if not enough heater will overheat you also might have too small gas line and are emptying it
It sounds like your pool heater might have a defective controller (the part, not you). Check the controller and replace if necessary. It could also be that you need to cycle the ignition sequence until the air is out of the gas line. It could also possibly be that your gas valve needs to be replaced.
One possible reason could be a bad thermocouple. This is a rod shaped device that is close to the flame. It's function is to turn off the gas if the pilot light goes out. Heat from the flame operates the thermocouple. When the flame goes out the thermocouple cools off and shuts off the gas. When one goes bad it will not let you light the pilot. Here's a picture of what one looks like. There's a bracket that holds it in place.
You have no flame rectification.....LLD series heaters check for a signal through the flame to ground; if the module does not detect this signal, it go through two more trials for ignition and then lock out the module. There should be a flame rod and it may need cleaning. I use steel wool.