I ran out of home heating oil and the tank was left on for several hours.(normALLY SET AT 125 DEGREES). i just got heating oil delivered and the furnace is running but an error code (ER3) shows on the water tank display. how can i correct this problem and set the temp back to 125 degrees?
Simply means hot water heater called for heat for 1 hour and never rose in temperature or reach stepping, unit automatically goes into lockout. I would reset power
It tells you that your water heater called for heat for more than an hr and never got hot enough to meet the demand.
CAUSES
-bad sensors
-no hot water from boiler
-bad thermal transfer
-low delta T across water heater
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SOURCE: not enough hot water. I have an Amtrol Extrol coil water heater
Since you mentioned 'both temperatures' it seems your unit is like most all of them, a lower and upper coil.
If your hot water supply runs out quickly, this normally means that the lower coil has failed.
Since heat rises, the upper coil will never supply a tankful of hot water, just hot to start, and then as the flow continues, it doesn't have time to do more than warm the water flowing into the tank.
Every home should now own a simple digital multimeter; they cost less than $20 US everywhere and one can find them in auto parts stores, electronic supply companies and tool companies.
If you have a Harbor Freight tool store in your area, you can get them for under $10 US any time and sometimes even less:
Digital meter
You need to be absolutely certain that the voltage to the water heater is shut down.
Before you measure anything else, set the meter to its highest AC setting and check across the coils and then from either contact to the metal housing.
If it is dead everywhere, then set the meter to the lowest Ohms scale (normally 200).
The resistance of the coil should be nearly the same reading as when you simply short the meter's probe tips together.
If it measures 'OL' then the coil is open and must be replaced.
SOURCE: ER3 no hot water
Er3 means that the water is being heated for more than 1 hour without reaching the set temperature.
Need new aquastat.
SOURCE: hot water not lasting long enough
Check for crossover to eliminate plumbing problems:
http://waterheatertimer.org/Crossover.html
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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