System for monitoring a combustion apparatus

A system for monitoring operation of a water heating apparatus to inform an operator to schedule maintenance, said apparatus being of the type having a burner for heating water by combustion and said system comprising

• monitor means for continuously detecting both a cumulative total time period of combustion during which said water heating apparatus has been combusted and a combustion frequency representing a number of times combustion has taken place in said water heating apparatus,
• first memory means for storing a first reference information value and a second reference information value,
• second memory means for storing and continually updating said cumulative total time period of combustion and said combustion frequency continuously detected by said monitor means,
• first switch means for outputting a display signal requiring display of said cumulative total time period of combustion and said combustion frequency,
• control means for receiving said display signal output from said first switch means and outputting a first control signal in response to said display signal, said control means comparing said cumulative total time period of combustion stored in said second memory means with said first reference information value stored in said first memory means, and further comparing said combustion frequency stored in said second memory means with said second reference information value stored in said first memory means, and said control means outputting a second control signal when said cumulative total time period of combustion becomes equal to or greater than said first reference information value or when said combustion frequency becomes equal to or greater than said second reference information value, and
• display means responsive to receiving said first control signal output from said control means for displaying said cumulative total time period of combustion and said combustion frequency stored in said second memory means, and responsive to receiving said second control signal output from said control means for displaying a message for informing the operator to schedule maintenance
• said system further comprising forcible operation-stop means for forcibly stopping operation of said heating apparatus when one of said cumulative totals is greater than a third reference information value.