Error code 128 r=8

This is not an error code. 128 r13 is the normal programming or software version for your model. you need to press the spa on button again, make sure the temp set point is higher then the actual water temperature

I don't have a definite solution however r9 is a heater problem it could be a short curuit between the heater and ground make sure the ground wire has not become loose or corroded

this is not an error code, its the startup sequence to your heater. after those numbers have been displayed you have to press the pool on button and set your temperature

128 r13 is not an error code. its the startup sequence of that heater

first ofall r 13 128 isnot an error code! blower comes on closes airswitch, then goes through all safeties, etc. need more info please ?

128 R9 isnt an error code

I am having the exact same problem. Same codes flashing. If you solved it let me know. I had just replaced the thermistor and Stack flu sensor and it was running fine. Previously it would read 126 and not fire, so I changed those 2 items and it ran fine for the last month. When I go out tonight 2/24/22 and the panel is lit up and reading a code. I shut everything off at the circuit. Flip it all back on and it gives all those codes. It will fire and start heating when I switch valves for proper pressure but doesn't let you adjust temp on the panel and just reads a code and won't shut off. Any help in troubleshooting. Thanks.

its not an error code

Code 30 is a problem with the heater circuit for the O2 sensor bank one sensor one which is the one in front of the catalytic converter.
Could be the sensor or the power source for the heater.
Code 128 is for low coolant temp which is usually a faulty thermostat.