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Posted by HeatPro on December 16, 2008 at 11:44:22:
In Reply to: old weil-mcclain boiler problems posted by Randy Creech on December 16, 2008 at 02:12:17:
Gas pilots have nothing to do with a transformer. As you aren't aware of that, you'd do best to call a pro before getting into danger.
But ... forewarned ...
well it may or may not be the thermocouple below is just some of what it could be.
1)Pilot flame
first you need to check that the pilot is on(lit)has it a correct size and flame pattern and is playing the thermocouple in the right place there is a hot and a cold spot on a thermocouple and it will not work if the cold spot is heated or the hot spot cold
2)Thermocouple may not be given right voltage
3)magnetic valve faulty
4)contacts could be dirty stoping voltage
5)interlock like The E.C.O. may have failed or operated
6)pilot flame may blow out from the main burner lighting or turning off (pilot in wrong place)
... and so on and on
a. low gas pressure
b. moisture dripping on pilot
c. dirty pilot orifice
d. dirt in pilot tube
e. low pilot adjustment
f. high pilot flame burning thermocouple out
g. heat exchanger hole so blower blows flame out
h. bad contact of thermocouple to gas valve.
i. overtightening of thermocouple end to gas valve so connection poor by crushing connector.
There are two tests to be made. The thermocouple must be tested to assure that when the pilot flame is applied, the thermocouple creates the required millivolts to hold the pilot gas open. This requires a millivolt tester while the flame is applied. There are tools available to do this test from Honeywell at the local supplier.
Once the thermocouple is tested and found to be OK. then the thermocouple is applied to the gas valve. The connection at the gas valve can be tested for continuity to see if it is broken or not using an ohmmeter. If there is continuity, the gas valve should hold open from the thermocouple current.