got a call from family we had put in a system for, 5-6 years ago, who had taken advantage of a pre-winter 'screaming senior special'. They say it took them 10 minutes to blow the dust off and used a dollar bill to clean sensor and ignitor. The issue they had was that now the water was 'to' hot. so I looked at the HW temp and it appears (they?) someone had turned up the heat to 155 degrees. (obviouse solution)
Here's question--has anyone used or heard of using paper money to clean the ignitor or sensor?