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Thread: Raypak P-R406A-EN-C start up problem

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    Raypak P-R406A-EN-C start up problem

    A local guy who I usually do HVAC work on the side for has a Raypak P-R406A-EN-C Natural Gas pool heater. He went to fire it up the other day and it won't light up. It will turn on and you can here the ignitor clicking but it won't light. I pulled that out from inside to see if it was sparking and it is and seems like a good spark. One thing I noticed was there wasn't any smell of gas, like as if it isn't getting through. I checked all valves/feeds to the unit, everything is open, cleaned off the burner tubes in case dirt was blocking them but no luck. He didn't have a manual but I was able to find one online. I'm getting good voltage everywhere it should be for low voltage and high voltage I believe. However it mentioned checking these 2 terminals on the circuit board behind the display. It said to check for 24 VAC across PV-MV/PV terminals on the PC Board. If voltage is okay, replace gas control; if not, replace PC board. I do not do hardly any service work and electrical is my weak point. I mainly do new installs. When checking with a multi-meter I want to put a lead in the PV terminal and one in the MV terminal and I should read out 24v? Or do I want to check each terminal with one lead in the terminal and the other lead in like a Common terminal?

    30' Round AG - Hayward 1.5 HP Cartridge - 4 4x20 Solar Bear Panels - BBB Only
    Installed June 2012 - North Central Connecticut

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Raypak P-R406A-EN-C start up problem

    Welcome to TFP.

    The voltage should be between the terminals. What are you seeing there?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Raypak P-R406A-EN-C start up problem

    It was 0.179 but I'm goin to recheck now cause I think I had the wrong terminals
    30' Round AG - Hayward 1.5 HP Cartridge - 4 4x20 Solar Bear Panels - BBB Only
    Installed June 2012 - North Central Connecticut

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    Pool Clown's Avatar
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    Sep 2008
    Silicon Valley, CA

    Re: Raypak P-R406A-EN-C start up problem

    If you get good voltage at the board, check at the gas valve(gas control) too. Raypak does not provide for the instance of rats chewing wires.
    Factory Warranty Station for:
    Jandy, Pentair, Sta-Rite, Raypak, Polaris,
    and Paramount pool cleaning systems.

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    Re: Raypak P-R406A-EN-C start up problem

    You may have a blocked pilot tube or orifice. You symptoms sound exactly like mine a few weeks ago. I have a raypack heater too but don't remember the model #.

    Do this, take out the pilot assembly together with the pilot tube. When you blow on one end you should feel some air coming out of the other end. If you don't it is blocked. I tried clearing the block with an air compressor with no luck. The orifice hole is very tiny so poking it with a a sharp needle is no use. I ended up replacing the pilot assembly which includes the orifice. I ordered the parts from The parts I ordered are below but yours maybe different depending on the raypak model that you have.


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