Pool heater won't ignite ...

[mjz]

I have a rheem M407 pool heater. It has electronic ignition and controls.

http://cdn.globalimageserver.com/fetchdocument-rh.aspx?name=digital-low-nox-pool-spa-heaters-raypak-digital-low-nox-brochure

Last season worked fine. This season - won't fire up.

The controls all seem normal. the temperauture is set above pool temp. The "spark" is showing on the LED panel and I can hear the igniter clicking (sparks?).
I can smell a faint whiff of gas from the pilot tube after I set the unit to call for heat. but no ignition. No error codes either.

Before I call someone, I thought I'd run the problem by this forum in the hope that someone experienced what I am experiencing and can suggest a few more options.

As far as I can tell - nothing is wrong (gas valve is on).

Thanks

 

[borjis]

Have you taken the front panel off to examine if any spider webs or other stuff is in there?

 

[Uavmx]

Try lighting it with a match while it's trying to light. See if you can see a spark.


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[TexasDeano]

I had similar issues. We (me and my PB) narrowed it down to a overly sensitive flow meter. So when I heat my pool now, I just make sure to bump up the pump's RPM's to increase the flow rate.

BTW, my heater is a Pentair heater and I found a really useful troubleshooting flowchart in the back of the user manual for it.