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Re: Pilot Light Goes Out
The VC701 has a safety switch located on the back of he heater that may be tripping after the call for heat is satisfied. Check that there is a good draft by testing with a match. Make sure the flame is drawn toward the vent system when the unit is off and cooling down. Check it at the draft diverter located below where the vent pipe is attached. It is a box with an open bottom. If the draft is not pulling air toward the vent system, the heat from the cooling heater will trigger the safety switch and shut off the pilot. You may have to raise the vent pipe to establish a draft.
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So are you saying the pilot stays lit, but the main burner won't always fire. If this is a millivolt system you could have a weak pilot flame, not getting the pilot generator hot enough or you could have a weak pilot generator. If you are handy you can try cleaning the pilot. It may be better for a qualified service tech.
in front of the burner it is next to a copper tube(black if it has been burned)! it angles a little towards the copper tube! u turn the knob on gas valve to pilot then hold down and light hold for one minute then turn it to the on position (u might have to push down slightly as u turn the knob) make sure u have thermostat to the lowest setting before u light the pilot so it won't turn on while u have your face too close to the heater then turn your thermostat up to desired temperature when it is on the the on position! Good Luck!!
The thermocouple needs to get red hot. If the pilot flame is too low or too high or if it is not pointed on the thermocouple well, it won't stay hot enough. If the pilot flame is too low, a draft caused by opening a door could blow it out. If correcting this doesn't fix it, it could be a bad thermocouple or control. The factory assembly on these heaters is not the best.
The pilot orifice could be dirty causing the pilot flame to be too small. Unscrew the pilot tube at the pilot assembly. The orifice is inside. Remove the orifice and blow it out with compressed air only. Reassemble and see if that fixes the problem. If the pilot flame is set too low, sometimes opening a door will cause a draft to blow out the pilot. If the thermocouple is good and the pilot flame is set properly, the control valve may be bad.
Make sure all the wire connections are good and tight. Next lift off the cover and look for a little thermal disc mounted up by top of the heat exchanger. Most have a re-set button but not all. If you have this ,by-pass it ,see if that solves the problem, if so it may be defective, or doing its job and you have a venting problem. If you don't have this and have changed the thermocouple (was it a copper tube with a fitting that screwed into the gas valve, or did it have 2 wires, that is a pilot generator, kind of same thing) make sure the probe is set correct, with the pilot flame heating the top 1/3rd of the probe. The only thing left is the gas valve.