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That is the circulation pump. when it stops moving water what voltage do you get on the board at white and black circ pump connections. Middle set of wires going into bottom of IQ box. On right hand section of circuit board.

Are you talking jet pump or circulation pump?

Zone 1 is for the internal lights Zone 4 is corner exterior lights (optional feature )

I think some of the Clorox extra blue has copper in it that will cause the sticky waterline especially if your water source is high in metals. This is just my experience and I do like the extra blue but on some customers with well water it needs the high metal levels addressed before adding chlorine. As stated above tablets should be avoided in most hot tubs.

Power and ready lights flashing together is indicator of circ pump flow issue. The pressure switch built into heater is not closing. Could be dirty filter, weak circ pump or bad pressure switch.Also verify the check valve opens and closes with jet pump operation. Remove filter from hot tub and see if the heater light on circuit board comes on. The pump looks like the original and even though it is moving water its flow is reduced and won't close pressure switch. Test the switch by removing connector from board with multimeter set to continuity.

Looks like the bots have taken over........

Yes, try the power supply first. About $60 instead of $600 and they do fail occasionally

If you are getting 230v red to black and 120 red/black to white going to the main circuit board on the right it's probably the power supply on main circuit board under the red, back and white wires. Hotspring p/n 78841

The ready light flashing is the temp thermistor. It is either no good, unplugged or plugged into board wrong.

If you have a cover lifter from Hotspring that screws into aluminum plates that are inside encasement make sure they are in replacement.

Where are you located? If you turn the jet faces counterclockwise they will unscrew from wall fitting. Take a look at o-ring gaskets and see what they look like. If white and you see cracks they have failed. To fix without cutting out plumbing and fittings requires sealing with Permatex ultra grey gasket maker according to Hot spring.

The spa is miswired If the wires in photo are coded correctly with white being the 20amp neutral and green ground.

I am in the USA so your spa is wired a little different could you show the inside of IQ box cover that has wiring and jumper configurations. ON USA Spas If the lim ok is not lit up the power light(red) on control panel will be flashing.

If the red power light is blinking all functions of spa will be locked out except circ pump operation. Can you access the IQ Box and let us know what leds are lit up And photos help..

On a 2008 control panel you have the red power light and green ready light . above is a blue fibre optic ambient light that is lit up from a led plugged into control panel . may need to check connection or wire behind bezel.