Bosch dishwasher not draining
Have older Bosch SHE56C06UC/22 which does not drain. After running cycle, bottom of dishwasher is full of water. Open/ reclose door and pump activates for split second then stops. Checked filters, drains, impellers and back flow stopper, and everything looks fine. Pulled from cabinet and manually activated pump. Drained well with no problem. Then ran Rinse and Hold cycle to see if pump would activate. It does not activate and sump is full of water. Tried this cycle several times(4) and it only drained properly without manual activation one time. Manually activating the pump (red plastic rod) drains with no problem. Is this a timer issue?