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Problem: prime failed - the spa control cannot detect the presence of water in the heater tube
Cause :An air lock is present in the pipework and the heater tube is not completely filled with water - for
safety reasons the element cannot be activated until the heater tube is completely filled with water
1) Press Pump A button to retry water prime => the pump will run for an additional 5 secs to attempt water prime. If successful the spa control will continue to operate in AUTO mode. If unsuccessful the spa control will return to the ER-3 WATER PRIME error condition
2) Check pool water level refill if necessary => press Pump A button to retry water prime
3) Turn mains power OFF => remove filter cartridges from spa completely => then turn mains
power back ON to retry water prime - If the spa has just been filled/refilled with water and this resolves the error, the problem was a result of an air lock trapped in the pipework which was freed by removing the cartridges. Turn
mains power back OFF => re-install filter cartridges => then turn mains power back ON
$) If error persists - the airlock must be manually expelled from the pipework => the easiest way to
do this is to turn mains power OFF => remove filter cartridges from spa completely and run water
from a garden hose down the pipework through the filter cartridge holes until any air bubbles are
expelled through the jets in the spa => then turn mains power back ON to retry water prime.