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Poly Planer class D amp overheat protection mode...

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Poly Planer class D amp overheat protection mode...

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Old 07-20-2018, 12:54 PM
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Default Poly Planer class D amp overheat protection mode...

Jim I purchased a Poly Planer class D amp back in Jan '16, after 2 yrs of flawless of operation it seems to be going into protection mode which basically cuts all power to the speakers. Red protect mode light is on when this occurs. Amp gets pretty warm when this happens, but nothing crazy.

Nothing new about the mounting location, it actually stays pretty cool.

Has the amp shit the bed?

I think it's out of warranty at this point - think it might have been 1 yr.

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Old 07-20-2018, 01:45 PM
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I looked at the amp again and found the input was set on ST and should have been set to 4 channel. Switched it and going to see how it goes. Also adjusted the gain down some.

If that doesn't work will check fuses and ground connection.

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Old 07-21-2018, 06:03 PM
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Nope, that didnt work...

Going to double check fuses and ground wire.
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Old 07-22-2018, 03:32 AM
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I'll check with Poly Planar direct. See if they have any suggestions.
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Old 07-22-2018, 04:49 AM
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Poly planar answered an email at 730 in the morning on a Sunday. Hard to beat that. They said protect mode can be caused by the amp not getting enough power. This could be a bad crimp, corroded wires or a bad battery. If I were you I would run a short pair of direct wires to a known good battery and see if it does it. Poly planar said you could send it in and they would take a look at it for you also if that isn't working.
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Old 07-22-2018, 07:41 AM
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Originally Posted by NickBOE View Post
Poly planar answered an email at 730 in the morning on a Sunday. Hard to beat that. They said protect mode can be caused by the amp not getting enough power. This could be a bad crimp, corroded wires or a bad battery. If I were you I would run a short pair of direct wires to a known good battery and see if it does it. Poly planar said you could send it in and they would take a look at it for you also if that isn't working.
wow thats great Nick, thank you for reaching out to PP and responding here. You're right, can't beat that!

fwiw, all 3 batteries are new group 34 dekas.

Ill pull the power wires from the amp and see how they look. I looked at the power connections on the bus bar without removing them and everything appears clean and and tight from the outside. But ill probably pull them and double check the crimps/connections as well as the back side of the connectors for any signs of corrosion.

will report back.
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Old 07-22-2018, 12:29 PM
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Can you put a meter on the amp and see what the voltage is when it's going into protect mode?
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Old 07-22-2018, 01:23 PM
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Originally Posted by NickBOE View Post
Can you put a meter on the amp and see what the voltage is when it's going into protect mode?
I can just not in my present location this week.
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Old 07-27-2018, 05:45 AM
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I "think" I solved it... In other words it didn't repeat itself yesterday while underway.

Loose ground connection bus bar.

Thanks!
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Old 07-31-2018, 03:13 PM
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Great news!
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