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What could be the problem with a Teledyne-Laars pool heater if the pilot light lights with no problem and the valve is ON but the burner will not start up?
Wiki User
∙ 11y ago
On the inside of the heater cover, and within the documentation shipped with the heater, there should be a diagram of the control circuit. These heaters will not operate if the pump is off (pressure switch), if the "fireman" switch is off (a switch generally inside the pump timer that disables the heater about 15 minutes prior to turning off the pump), nor if both of two additional high temperature limit switches are activated (models will vary). The fact that the pilot is lit indicates that the pilot generator is OK. If you can turn the burner on by shorting the control circuit manually (using a jumper wire) the problem is in on of the safety limit switches, or in the thermostat itself. Good Hunting!
http://www.poolcenter.com/parts_heaters_laars_xe_pg1.htm
A pilot generator may have enough power to operate the pilot ,however not be sufficient to operate the main valve as well, this is quite common.
The way I test a millivolt system of any type is I have a AA battery holder from RadioShack with a positive and negative lead, I disconnect the pilot generators 2 leads and replace them with the AA batterys. The battery is 1.5v it wont hurt though, but if the gas valve wont open and you do get voltage to the gas valve terminals for the main valve, the valve is either bad or stuck, an amp draw will tell you if its trying to work or shorted perhaps if excessive.
There are a limit and on off and thermostat on this unit I believe as well .
Wiki User
∙ 11y ago
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