Question about Heating & Cooling
Ceck if there is spark.
If there is no spark, then the igniter may need replacement. Testing is done reading volts.
If there is spark, then either valve coils or flame sensor may be causing the problem.
Valve coil can be tested reading Ohms at coil contacts (power off first). If the coil reads infinite Ohms, then it must be replaced.
If coils are good, then the flame sensor must often be replaced. This is more difficult to test.
In some case the valve may be mechanically faulty (stuck), or wiring and control board may be responsible of the problem.
Posted on Aug 16, 2010
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