Resident script pump circulation

[Domoticatorino]

Code:

valveStatesTag = 'pompa_circolazione_giorno' pumpGA = '2/0/1' opened, first_timestamp = false, 0 valveStates = grp.tag(valveStatesTag) for v = 1, #valveStates, 1 do  valveState = valveStates[v]  if valveState.value then    opened = true    if first_timestamp > 0 then        if first_timestamp > valveState.updatetime then first_timestamp = valveState.updatetime end    else        first_timestamp = valveState.updatetime    end  end end if opened then    opened_5_minutes = (os.microtime() - first_timestamp) >= 120    if opened_5_minutes then        grp.checkwrite(pumpGA, true)    else        grp.checkwrite(pumpGA, false)    end else    grp.checkwrite(pumpGA, false) end

Hi, I use this script above and it seems does not work. I use 120 sec to check without loosing too time. Unfortunately Pump does not start.
What do you think?
Thanks.