I have a Hayward H100ID Spa Heater. When the filter is on, the fan will run (press.switch is made) and the blower will run for about 10 seconds and then stop. After about 20 seconds, the blower will go on again for 10 seconds and stop again. This cycle will repeat 3 times and then the blower will not go on at all (but the fan will cont. to run). I have cleaned the igniter, replaced the temp.switch and checked all switches(temp.limits and air) and thermostat. If the problem is the ignition module ($$$), how do I check it?
I had a similar problem and it turned out to be the solder connections on the control module. The connector that is soldered to this board (comes from the gas valve) needed to be re-soldered.
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