I've got a tankless electric water heater from eemax. that stopped working the other day. eemax won't provide any component level support, but I've ordered a new board for $45.00.
When I opened up the unit, after switching off the circuit breaker on the 240V AC line, I observed that a big (maybe 3-5 watt) (metal film?) resistor was discolored and was an open circuit. The markings look like 100 ohms, but because of the discoloration it's hard to be sure. I say metal film because the resistor is pale blue in color. The resistor feds a neon indicator bulb... (And probablly more of the circuitry.)
My question. Is 100 ohms a good value as a current limiting resistor for a small neon lamp running off 240 V AC? (60 Hz if that matters.) I'm not sure what the I-V curve for the lamp will look like. (Is the one shown here OK?)
Thanks for any advice.
George H.