NO CH. DHW OK.BYPASSED EXTERNAL CONTROLS INC TIME CLOCK.PRESSURE 1BAR . NO HEATING & NO VOLTS ON PUMP IN HEAT MODE.RUNS OK ON DHW. NO WARNING LITES ON JUST POWER ON NEON.CHECK BOTH MICRO SWITCHS & SWAP OVER NTC SENSORS.WAS OK TILL SYSTEM DRAINED, CAN ANYONE HELP.