E06 & 07 - Meaning
Occurs when supply voltage is too low to operate the valve.
Possible reasons:
Batteries are low (may display random error codes in this case not just E06 and E07).
Damaged battery contacts (dirty, corroded, bent so not making strong contact with batteries)
Short circuit in external wiring or connected accessories (i.e. wired control panel, cable shorting to
chassis earth.)
Defective power plug power supply (if used) or damaged wiring to it.
Contact problem of slide isolation switch (moving on/off..on/off several times may clean contacts)
Batteries not in correct way around