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"Invalid Pump" fatal error on Garmin GHP10 autopilot

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"Invalid Pump" fatal error on Garmin GHP10 autopilot

Old 09-02-2017, 05:51 AM
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Default "Invalid Pump" fatal error on Garmin GHP10 autopilot

Greetings all ... i am very impressed with the knowledge in this forum! Researched this topic but could not find the answer, so I decided to post it directly here:

Configuration: Garmin GHP10 + Garmin GHC10 + 1.2L pump + Garmin 8212 + Garmin 1040
Error: when starting, autopilot will beep, shows an "Invalid Pump" error, starts shutdown in 60 seconds. Garmin 8212 display same error "invalid pump"

How did it happen: we were trolling slowly in the intercoastal waterway and i turned on the switch of a LED spreader light. Yes, just turned ON the spreader light, and it did something as the autopilot, that was NOT engaged, displayed the error.

I tried resetting the system and unplugging-replugging the cables on the ECU unit, to no avail.

I called Garmin support. They asked me to check the impedence on pins 2 and 7 on the control cable connecting the pump to the ECU. If 2500 Ohms, ECU needs to be replaced. If not, pump needs to be replaced. I will go to the boat today with an ohmmeter to do the test.

The light on the ECU starts, blink sred, then go to green, then back to red.

To the experts on this forum: do you think the spreader light connection was installed improperly and created a spike that could have fried the pump or the ECU? Or was it a stuoid coincidence that happened in the same second when i turned on that switch?

Thanks all!
Ned
Old 09-02-2017, 05:40 PM
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Default Update

Today, I checked the resistance between pins 2 and 7 on the ECU.... and it showed 2500 ohms approximately, indicating that the pump is good. The garmin service rep asked me to RMA the ECU.

So while boating back, in a rough sea, the main GPS unit, the Garmin 8212 went dark. The screen would be beep when touched, but nothing can be seen. So I turned off the entire system from the 1040 GPS, and restarted the system. And low and behold, the 8212 started in a dim screen (<50% brightness), but the autopilot worked just fine !!

I pumped the brightness of the 8212 to my liking, and tested the autopilot. It engaged properly, and the shadow drive worked.

GO FIGURE !!

My only speculation at this stage: restarting the 8212 AFTER turning on the autopilot made the 8212 recognize the pin numbers, or something, .... For now, I will keep observing and reporting back.

If anyone has any speculation of what went wrong then back , I would love to read about it. Maybe the software needs updating ?
Old 09-03-2017, 02:49 PM
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Usually means bad rotary encoder.
Old 09-03-2017, 04:55 PM
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V80BoatBuilder: wow... i ggogled rotary encoder and couldn't find if this is a component of the pump or a standalone box to look for. Could you help?

Also todya, the sonar stopped working for few hours. I restarted the entire system, and the sonar worked again, but the autopilot went back into "Invaid Pump fatal error". Could a grounding or bad power connection create these issues? Is this something that i can investigate with simple tools (digital voltmeter)?

Thanks in advance!
Old 09-04-2017, 06:42 AM
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The encoder is the black cylinder on the back of the pump, with the multi-pin plug (smaller wire than the actual pump).

It could also be the ECU, but I give it a 70% chance that it's the encoder. Cheaper and easier, if Garmin will sell it to you. You may need to buy it through a dealer/service center.
Old 06-12-2020, 06:08 AM
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Originally Posted by Yaredna View Post
Today, I checked the resistance between pins 2 and 7 on the ECU.... and it showed 2500 ohms approximately, indicating that the pump is good. The garmin service rep asked me to RMA the ECU.

So while boating back, in a rough sea, the main GPS unit, the Garmin 8212 went dark. The screen would be beep when touched, but nothing can be seen. So I turned off the entire system from the 1040 GPS, and restarted the system. And low and behold, the 8212 started in a dim screen (<50% brightness), but the autopilot worked just fine !!

I pumped the brightness of the 8212 to my liking, and tested the autopilot. It engaged properly, and the shadow drive worked.

GO FIGURE !!

My only speculation at this stage: restarting the 8212 AFTER turning on the autopilot made the 8212 recognize the pin numbers, or something, .... For now, I will keep observing and reporting back.

If anyone has any speculation of what went wrong then back , I would love to read about it. Maybe the software needs updating ?
How did you determine which pins were 2 and 7? I have the same issue.

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