Reason #1: Bad thermostat
But when a thermostat goes bad, it sometimes gets “stuck” and doesn’t turn off the element it serves. This allows the element to keep heating the water until the reset button trips. If this is the problem, you’ll need to replace the thermostat.
Accordingly, do you have to drain a hot water heater to change the thermostat?
Always disconnect the power or shut off the breaker before doing any work on a water heater. To change thermostats, you will need to remove the access panel and safety cover (do this for both upper and lower access panels on dual element units).
In respect to this, how do I know if my thermostat is working properly?
Check the screen: Check the screen of the thermostat and make sure that it is lighted. A blank or unlighted screen could indicate a thermostat failure. Check the batteries: Many modern thermostats rely on battery power to operate. If the screen is blank or unlighted, a battery change could solve the problem.
How do I reset my water heater thermostat?
Somewhere on your electric water heater, you’ll find a reset button. It’s usually red and often located near the thermostat. It may also be hidden behind a removable metal panel on the unit—and then behind some insulation. Once you find the button, push and release it.
How to Test an Old Thermostat
- Step 1: Turn off HVAC power. This can be done by switching the furnace to the off position if your system has an on/off switch. …
- Step 2: Remove thermostat cover. …
- Step 3: Remove wires from terminals. …
- Step 4: Turn the HVAC power back on. …
- Step 5: Test other wires.
Test the lower portion of the thermostat, by touching one lead to the common terminal (next to the temperature setting) and the second lead to the left heating element terminal. If the water in the tank is below the thermostat’s set temperature, the multimeter should read close to zero ohms of resistance.
Hot water systems are generally expected to last around 8 to 12 years.
The average thermostat replacement cost is between $100 and $300. Most other repairs are equally affordable. There are two main types: gas and electric. A gas unit works by way of a gas flame while an electric one works using electric elements, or coils.
From time to time, it may be necessary to reset your home’s thermostat. Resetting your thermostat means you are resetting it to its factory setting, which can help resolve issues with programming, your HVAC system or thermostat connection issues.
When your thermostat stops working correctly, it can fail to regulate the temperature in your electric water heater properly. This, in turn, will cause your water to heat up to dangerous levels, which will cause the reset switch to trip.
The most common cause of burned out elements on new water heater installations or new element replacements is DRYFIRE. This happens because the installer fails to open a hot water faucet while the heater tank is filling with water and therefore purging or bleeding air from the system.
One common thermostat problem with electric water heaters occurs when the lower thermostat becomes “stuck” in the ON position and doesn’t cycle the lower element off properly. When this happens, heat builds up in the upper portion of the storage tank, which will eventually trip the reset button.
An electric storage-tank-style water heater has two thermostats because it has two heating elements. The thermostats are designed so only one element is active at a time. The reason only one element is active at a time is because it allows for smaller wire sizes and lower amperage demand when in operation.
If an electric water heater is not producing hot water, it could be a simple problem like a blown fuse or tripped circuit breaker. Additionally, some electric water heaters have a circuit-style safety switch located near or on the thermostat.