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Old 10-09-2021, 09:04 AM   #21
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Originally Posted by Txh2oskier View Post
Voltages...


At plug 120
both sides of fuse 119
at board going to heater 119


Unfortunately my multimeter doesn't do amps so I'm not able to see what the heater is drawing. Hope to solve that problem today!
And the heater is only 141 degrees? If it is a 44 ohm load and being fed with 119 volts, should be dissipating 327 watts. Did you measure this voltage with the heater still connected? Something is wrong, but as long as the heater is getting 119 volts, the board is trying to heat it.

You can solve it today by turning on the propane.
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Old 10-09-2021, 09:32 AM   #22
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And the heater is only 141 degrees? If it is a 44 ohm load and being fed with 119 volts, should be dissipating 327 watts. Did you measure this voltage with the heater still connected? Something is wrong, but as long as the heater is getting 119 volts, the board is trying to heat it.

You can solve it today by turning on the propane.

I have now checked voltage both with the heater connected and disconnected. Disconnected gave me 119 VAC, connected gave me 118VAC.


Sorry, the problem I'm solving today is not having a multimeter that does amps. I have plenty of time on the refrigerator.
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Old 10-09-2021, 09:39 AM   #23
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Originally Posted by Txh2oskier View Post
Voltages...


At plug 120
both sides of fuse 119
at board going to heater 119


Unfortunately my multimeter doesn't do amps so I'm not able to see what the heater is drawing. Hope to solve that problem today!
Use Ohm's Law. Disconnect the heater and measure it's resistance.

Volts ÷ Resistance = Amps
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Old 10-09-2021, 09:48 AM   #24
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I have now checked voltage both with the heater connected and disconnected. Disconnected gave me 119 VAC, connected gave me 118VAC.


Sorry, the problem I'm solving today is not having a multimeter that does amps. I have plenty of time on the refrigerator.
Well, if your resistance measurement is close and your voltage measurement is close, the heater should be pretty hot! Doesn't seem so. 140 degrees isn't going to make the reefer run. Since the voltage is there, the board is trying. You should be able to confirm by holding the heater in your hand as 140 is about the average domestic hot water temp. If you can...you need a new heater.
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Old 10-09-2021, 09:51 AM   #25
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Use Ohm's Law. Disconnect the heater and measure it's resistance.

Volts ÷ Resistance = Amps

118 / 44.4 = 2.68 Amps


So...

If 44.4 ohms of resistance through the heater is in spec, the heater is getting sufficient AC power but isn't heating up to the right temperature, possible my thermometer is bad but the frig isn't working on AC power. What's left?
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Old 10-09-2021, 10:08 AM   #26
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Use Ohm's Law. Disconnect the heater and measure it's resistance.

Volts ÷ Resistance = Amps
He did. More apt is I squared R. 44 ohms would draw 2.7 amps. If all is correct, that little heater is dissipating 320 watts! Should be a lot hotter than 140 degrees. Now...if the thermometer was set to Celsius, then 285 F sounds more like it!
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Old 10-09-2021, 10:22 AM   #27
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He did. More apt is I squared R. 44 ohms would draw 2.7 amps. If all is correct, that little heater is dissipating 320 watts! Should be a lot hotter than 140 degrees. Now...if the thermometer was set to Celsius, then 285 F sounds more like it!

After being on for a couple of hours the temperature reads 65C or 150F.
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Old 10-09-2021, 10:49 AM   #28
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After being on for a couple of hours the temperature reads 65C or 150F.
From a Dometic exchange on IRV2...

"Just checked ours and it is around 140F. Cannot keep finger on it for very long.
Boiler temp is in the 350F range inside the flue stack assuming it is operating normally in a level condition."

So if it is the heater itself at 140, you need a new one.
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