Question about Pentair 250k Minimax Ch Ng Mv Heater

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I have a minimax 250 that will only ignite if cranked to max heat. This can get very annoying when you don't want this much heat. Burners are clean. Pump pressure is normal(18psi). Suggestions please?

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Sounds like a defective thermostat or temerature sensor.

Posted on Aug 22, 2009

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1. There is air in the gas line. Power down the heater and allow it to try igniting until lockout. If it locks out, repeat the process. Most lines will clear within 4-5 attempts to ignite.

2. A plugged burner orifice. Run a small pipe cleaner in the brass fittings on the burner tray. They may have small webs in them restricting gas flow.

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