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Pentair Minimax heater not working

Heater is approx 7-8 yrs old. No error codes other than 1 flash on the Fenwal indicating airflow fault and there are 2 green leds lite on the back of the DDTC which are the HiTemp and the Tfuse. (the PV and the Fan are "NOT" on) The fan does not come on at all and there is 24v at the ignition module and at the TH. Checked the thermal fuse and it appears good. Bypassed the airflow switch but no change on starting the fan.
Could it be the ignition module?
(I'm assuming the ignition sends to the airflow switch and and fan??)

Are all 4 LED's on the rear of the control board supposed to be ON for normal operation or OFF?

Any ideas on a fix would be appreciated.

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Permalink Reply by Pentair Product Technician-Ben on February 2, 2012 at 2:45pm

The board will activate the LED light on the board after that circuit is completed, so ON is good.

It could be the fan itself, or the module not completing the circuit to send power to the fan. If you are qualified, here is the test procedure:

The module has a F1 and F2 connection. Remove this connector and you can jumper the two wires in the connector (not the prongs on the module). This will connect 120VAC (be careful) from F1 to F2 and the fan should start.

If it starts, the module is the problem. If not, the fan is the problem.

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Permalink Reply by HK on February 3, 2012 at 10:21am

Thanks....fan starts OK.

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