Carol, a lot easier over the phone but here goes.
A good one I recommend Progressive Industry will protect for multiple errors.
Here is their web page.
This is the pedestal model.
And this is the hard wired model which I use.
The error codes are
E-0 Normal Condition
E-1 Reverse Polarity Condition (hot and neutral wires reversed)
E-2 Open Ground
E-3 Line 1 Voltage High (above 132 volts)
E-4 Line 1 Voltage Low (below 104 volts)
E-5 Line 2 Voltage High (above 132 volts)
E-6 Line 2 Voltage Low (below 104 volts)
E-7 Line Frequency High (above 69 cycles)
E-8 Line Frequency Low (below 51 cycles)
E-9 Data Link Down
E-10 Replace Surge Protector Module.
Lets try this for a start. Pm me if you or they would like my phone number.