| 摘要 |
<p>PURPOSE:To permit quick repairing by a method wherein a plurality of remote control units is provided and the trouble of a remote control unit is indicated in an indicator when either one of the control units is in trouble. CONSTITUTION:A main remote control unit 4A receives data, such as combustion condition, a detected hot-water temperature or the like, from a main control unit and transmits the data to remote control units 4B, 4C whereby controls respective lamps 17-19, respective indicating units 21-24 and an indicator 20. When the control unit 4A addresses control units and the unit 4A does not receive any signal to respond the address within a predetermined time, the unit 4A outputs to a control circuit 26A a signal to indicate an error code, which means that the main control unit is abnormal, in a hot-water temperature indicator 20 instead of a hot-water temperature and lights up the indicating unit 21 whereby a fact that the main control unit is in trouble is informed. Next, the control unit 4A addresses the remote control units 4B, 4C and when tnere is any abnormality, the error code is indicated to inform the abnormality while the indicating units 22, 23 are lighted up.</p> |
