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Re: Gas is on, there is spark from ingnitor, but the...
The unit is equipped with a themocouple that sends a small amout of voltage to the regulator telling it there is a pilot present, and allows it to open.
If the thermocouple is out of position, or dirty/sooty, the voltage will not register as flame present, and the pilot will not stay lit after releasing the button.
Clean or replace the thermocouple to fix your problem. Sometimes fine grit sanpaper will clean it up nicely without replacement.
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If the dial is a rotory type of gas valve it should move to the pilot position, light the pilot and then continue to full. If the dial is stuck and will not turn at all it can sometimes be loosen by spraying some oil into the spindle. This would require several sprays and try very gently to turn but do not add excessive force - that could break the spindle. If it turns to pilot but pilot does not stay on this is normally a worn thermocouple, simple and cheap to replace. Found this site very useful, patio heater problem solving.
1- turn the toggle switch to the ON position.
2- Turn the gas valve dial to the PILOT position.
3- Depress the pilot button while pressing the ignitor until you see a flame. Continue to depress the pilot dial for about 30-60 seconds.
4- let go of the button, and the pilot flame should stay lit. If it does , then turn the gas valve dial to the ON position.
5- Set the temperature and your done.
Open up the union in the gas line and bleed all the air out. Once done the pilot should light in a short amount of time. If it still will not light, remove the pilot and inspect it for spider nests in the head or regulating cap.
Do you physically see the spark or are you just hearing it. You can also take the igniter wire off of the control module and disconnect the pilot gas tubing from the gas valve. Turn the heater on and wait to see if you hear and smell gas coming out of the gas valve. If there is no gas check for 24v at the PV connection on the module. If there is voltage the problem is the gas valve. If no voltage the problem is the ignition module. If there is gas I would replace the pilot and gas tubing.
Santa Clarita Pool Heater Repair
Thank you for posting your question here on Fixya.com. Has anyone replaced the pilot generator yet? A millivolt heater (one with a pilot light) requires about .75 volts from the generator to operate. As the generator ages it puts out less and less voltage and eventually gets to weak to even hold the pilot gas valve open. Replacing it with a new generator will usually fix the problem you describe. If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved! John
There should be instructions on the inside of the heater access door. Make sure you are comfortable working with gas heaters. Make sure the shutoff valve supplying gas to the heater is on. Turn the gas valve to "pilot", press and hold it while attempting to light the pilot. Once the pilot is lit, continue holding the gas valve knob down for about 30 seconds. The pilot should stay lit once you release the knob. If the pilot stay lit, turn the gas valve to "on". Replace the heater access door and make sure you have proper water flow and attempt to light the heater. If it will not light, or the pilot will not stay on, you will probably have to replace the pilot generator. It provides voltage to run the heater and after time it wears out and produces less and less voltage. A millivolt heater runs on less than one volt so any power loss can be a problem. If you are able, test the pilot generator with a multimeter to see if you are getting at least 500mv when the pilot is on. If not, you should replace the pilot generator or even the entire pilot assembly. Hope this helps...
Sometimes you have to completely disassemble the pilot assembly to clear the blockage, the orifice for the pilot jet is very small and you can not get directly to it unless you take it apart. If this does not help, you may need a new valve.