E06 & 07 - Meaning
Occurs when supply voltage is too low to operate the valve.
Possible reasons:
Batteries are completely flat( may display random error codes in this case not just E06 and 7).
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 switch (moving on/off..on/off several time may clean contacts)
Batteries not in correct way around