Carlin 900nnn series control

Jamie Hall

Any ideas on why a Carlin 900nnn series control for an oil-fired hot water heater would be dying? I've replace 2 of them in the last 3 months on a job -- ground looks good, neutral's good, power's no worse than any around here (Connecticut -- pretty lousy power, but not that lousy I would think). The original control was a 90000C which lasted 2 years; it died, replaced it with a 90000B (which is all I had on the truck) which lasted 3 months; just replace that with a 90200...