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10-17-2018, 09:35 PM
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#1
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Senior Member
Join Date: Sep 2006
Posts: 187
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Magnum Inverter showing Internal Bridge Fault
Came back to motorhome after being away for 3 weeks (while plugged into 50amp source) to find low voltage for both house(9.1v) and chassis (2.6v) batteries. Inverter/ charger cycling on/off. Inverter display now showing Internal Bridge fault. Inverter toast? Or something else?
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10-17-2018, 09:47 PM
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#2
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Community Moderator
Join Date: Sep 2011
Location: Between the Oceans
Posts: 8,034
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You don't say which model... You can try a master reset by pressing and holding down the power button for 15 seconds. If this doesn't work, the control board could be failed. Call Magnum tech support for assistence.
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Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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10-17-2018, 09:56 PM
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#3
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Senior Member
Join Date: Jul 2018
Posts: 3,165
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Quote:
Originally Posted by gandl2
Came back to motorhome after being away for 3 weeks (while plugged into 50amp source) to find low voltage for both house(9.1v) and chassis (2.6v) batteries. Inverter/ charger cycling on/off. Inverter display now showing Internal Bridge fault. Inverter toast? Or something else?
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Inverter changes 12 volt DC to 120 volt AC.
Converter changes 120 volts AC to 12 volts DC Charges 12-volt house battery.
Use a multi-meter to measure what is coming out of the converter. Most converters don't charge the chassis batteries.
Did you check shore power?
__________________
2011 Keystone Sprinter 323 BHS. Port Charlotte Fl/Hinsdale MA. Retired Master Electrician. All Motor homes are RV's. All RV's are not Motor homes.
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10-17-2018, 09:56 PM
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#4
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Senior Member
Join Date: Nov 2015
Posts: 26,810
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An "internal bridge fault" means that one of the main semiconductors that performs the voltage-flipping is broken.
Inverters use what's called an "H-bridge" to route the DC currents back-and-forth to create AC.
Have you done a 'Reset'?
6.2 Performing an Inverter Reset
Press and hold the Power ON/OFF pushbutton for approximately fifteen (15) seconds until the Charging/Inverting Status LED comes on and flashes rapidly. Once the rapid flashing has begun, release the Power ON/OFF pushbutton. The Status LED will go off after the pushbutton is released.
After the inverter reset is completed, press the ON/OFF pushbutton to turn the inverter ON.
Some older inverter models do not allow an inverter reset. If the inverter reset fails, you will need to power-down the inverter using the procedure below.
In either case, if an internal fault does not clear, the inverter will require repair at an authorized service facility.
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Dodge 3500 w/Tractor Motor
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10-17-2018, 11:35 PM
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#5
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Senior Member
Join Date: Sep 2006
Posts: 187
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Inverter is model MS2812. No problem with input power. EMS shows 120v on both legs, air conditioners work fine. Have done the inverter reset. The internal bridge fault displayed after doing reset.
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10-17-2018, 11:43 PM
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#6
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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Soft reset didn't work. Try a hard reset - remove 12vdc input to the inverter by disconnecting battery cable and reconnect.
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Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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10-18-2018, 08:27 AM
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#7
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Senior Member
Entegra Owners Club
Join Date: Jun 2004
Location: Bayfield, Ontario
Posts: 5,465
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Quote:
Originally Posted by gandl2
Inverter is model MS2812. No problem with input power. EMS shows 120v on both legs, air conditioners work fine. Have done the inverter reset. The internal bridge fault displayed after doing reset.
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According to Magnum after doing a reset if the fault remains it is toast and needs to be repaired or replaced.
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Don & Gerri
2014 Entegra Anthem 44B
2014 Honda CRV Touring
1300W Solar, 1200AH LiFePO4 FMCA F443497
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10-18-2018, 09:04 AM
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#8
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Senior Member
Join Date: Dec 2011
Location: Houston TX.
Posts: 2,356
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If you must replace look at boat web sites out of Florida for cheapest replacement costs. Mine went south and cost to replace board was half the cost of new. Unit was older and in my opinion not worth putting more into.
Good luck
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Full timed in 2008 Newmar Essex. Currently part time in 2020 Entegra Esteem 29v tow Jeep Wrangler
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10-18-2018, 10:05 AM
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#9
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Senior Member
Join Date: Sep 2006
Posts: 187
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Quote:
Originally Posted by 757driver
According to Magnum after doing a reset if the fault remains it is toast and needs to be repaired or replaced.
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Tiffin agrees. They will replace my inverter under warranty. Still does not explain why my chassis batteries also discharged.
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10-18-2018, 11:07 AM
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#10
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Senior Member
Freightliner Owners Club
Join Date: Apr 2004
Location: Show Low Az
Posts: 1,323
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First order is to look through your manual or go Online and download a copy
Manual and see if it there:
"Internal Bridge - This fault message displays and the inverter shuts down because the internal power-bridge protection circuit has been activated"
Remedy: Perform an inverter reset. See Section 6-2. After resettingthe inverter, press the ON/OFF INVERTER pushbutton to turn the in-verter on and verify the fault has cleared. If the internal fault remains,the inverter will require repair at an authorized service facility
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Dale&Susan, 08 Alfa Gold, DaGirlsRv Blog
2015 F-150XLT_2000W Solar_800 AmpHr Lithium
Magnum_MSH 3012 & PT100
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10-19-2018, 08:37 AM
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#11
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Senior Member
Entegra Owners Club
Join Date: Jun 2004
Location: Bayfield, Ontario
Posts: 5,465
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Quote:
Originally Posted by gandl2
Tiffin agrees. They will replace my inverter under warranty. Still does not explain why my chassis batteries also discharged.
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Very possible your chassis batteries will receive a charge via the house batteries when the house batteries are above a certain voltage. If the charger no longer works and the chassis batteries have a large parasitic draw then they will discharge and no way to recharge them via the inverters charger.
__________________
Don & Gerri
2014 Entegra Anthem 44B
2014 Honda CRV Touring
1300W Solar, 1200AH LiFePO4 FMCA F443497
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