Question about Honeywell Rth6350 5-2 Programmable Thermostat

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Thermostat help! Screen is displaying "FA" where temperature would be and "IL" where time would be. Does not turn on at all other than that.

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  • Sarah Marshall Apr 24, 2013

    Honeywell Rth6350 5-2 Programmable Thermostat

  • Gene Haynes Apr 25, 2013

    Honeywell posts their product manuals in .pdf format:https://customer.honeywell.com/resources... Download pdf, then use Ctrl+F to search. Your problem might be battery. There is a battery located on back of thermostat. Pull thermostat off wall and then replace two AA batteries. Otherwise, this product has 1 year limited warranty, which usually means replacement is cheaper than mailing product to Honeywell for warranty claim while waiting for possible replacement.

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Add a comment with Brand, model, and type of appliance. This will help locate product manual and resources.
Otherwise, you could have Bosch tankless water heater that needs to be delimed, or maintained, flame rods are bad or dirty, or PC board has gone bad etc
http://hometips.me/Tls/Bosch_EA_error_code_troubleshooting.pdf
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html#delime
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Posted on Apr 24, 2013

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How to turn up the temp. on a Rheem mod. 82v52-2 hot water heater


To adjust the thermostat, turn off the water heater. Then remove the access panel(s) and any insulation. The access panels are above the drain valve. Take a small flat blade screwdriver and rotate thermostat dial pointer. (The lower temperature settings are to the right.) Replace the access panel(s) and insulation and then turn on the water heater. Do not remove the protective cover on the thermostat.

Wait for water to heat and then check the temperature at various faucets. Make sure to adjust the anti-scald temperature limiter at any faucet that may be accessed by a small child or adult who might be injured by high water temperatures. (Just put a thermometer in the flowing water. Check the faucet installation information. The high temperature limiter will be under/behind the handle for single handle fixtures.)

I hope this helps.

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How do I deleate the change filter light?


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4 blinks / high temperature shutdown


some elemente is in short circuit. test the follow steps and fix it. God bless you
oubleshoot a thermostat:
  1. Shut off power to the heater at the electric panel and post a sign warning others not to turn it on.
  2. Unscrew and remove the electric water heater access panel.
  3. Using a small screwdriver, turn the thermostat dial counterclockwise to lower the temperature, or clockwise to raise it. If the water heater doesn't maintain the proper temperature, test the thermostat.
  4. Disconnect one wire to the upper thermostat to test it. Set a multimeter to RX1 (resistance times 1) and touch a probe to the thermostat terminals as indicated in the owner's manual. Depending on the model and the terminals tested, the tester should show infinity ( open) or about 0 ( closed).
  5. Test the lower thermostat in the same manner.
  6. If necessary, replace the thermostat. Unscrew it from its mounting and install one of the same model, size, and rating. Once you install it, adjust the thermostat following instructions in your owner's manual.
Test and replace a heating element:
  1. Turn off power at the electric panel and post a sign warning others not to turn it on.
  2. Remove the access panel on the electric water heater.
  3. Disconnect one of the element wires and set a multimeter to RX1000 (resistance times 1,000). Touch one probe to an element mounting bolt and the other to each element terminal screw, in turn. If the tester displays anything but infinity ( open circuit), replace the element.
  4. If necessary, set the multimeter to RX1 and touch the probes to the terminal screws. If there is any resistance reading at all ( closed circuit), then the element is good. If not, replace it. Both upper and lower elements are tested in the same manner.
  5. To remove the element, first drain the heater.
  6. Disconnect the remaining element wire. Remove the mounting bolts holding the element in place. Remove the element.
  7. Replace the heating element with one of the same model, shape, and rating. Make sure you also replace any installation gaskets.
Test and replace a high-limit cutoff:
  1. Disconnect power to the heater at the electric panel and post a sign warning others not to turn it on.
  2. Remove the upper access panel and push the reset button.
  3. Replace the access panel and turn the power back on. If the water is hot, the reset was the problem. If not, you'll need to turn the power off again and reopen the access panel.
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Thermostat reset trips continually


Here's an article detailing electric water heater repair, that will be helpful to you.

Generally, when the reset button must be activated repeatedly, it indicates that one of the thermostats is not working properly. It is failing to sense the the actual temperature of the water in the tank.

This may be caused by a number of different things with the more likely being a defective thermostat, water damaged thermostat, poor contact of the thermostat with the tank itself (this can be due to rust build up between the two or insufficient spring pressure holding the thermostat against the tank).

You should do a visual inspection of the thermostats (with the power off!) to rule out the poor spring pressure, presence of rust or water and water damage to the thermostat. Repair sources of leaks if possible, remove thermostat(s) to clean the mating surfaces behind it and replace thermostats / parts that are weak or bent (in the case of the spring clip); wet or show evidence of earlier water damage.

Once the thermostat(s) can properly detect the rising temperature of the water being heated by the heating element again, it will shut off power to the heating element when the water matches the temperature you have selected. When the thermostat is unable to accurately determine the water temperature due to poor contact with the tank, the thermostat will continue too allow power to flow to the heating element - causing the water temperature to rise significantly higher than the level selected. This is when the high temperature switch operates to prevent the water from being heated any more. Needless to say, scalding is a very real threat any time the heaters continue to heat the water to a temperature higher than 140 degrees.

I hope this helps & good luck!

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1) Copy following links:
http://waterheatertimer.org/How-to-test-water-heater-thermostats.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

2) There is no reliable way to test electric water heater thermostats.
This is because testing requires rotating the temperature selector, which may cause stuck-thermostat to temporarily unstick. So thermostat appears to work normally.
Moreover, thermostat come out of calibration over time, and the temperature selector might be on 125 but tank temperature at 100, and there is no specific way to measure calibration.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

3) I think it easier to replace both upper and lower thermostats to eliminate them as suspects when diagnosing wide-range of electric water heater problems.

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Before calling service technician, open following link for Rheem tankless troubleshoot resources, including on-line chat
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Rheem technical service bulletin for de-liming:
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

De-liming Manual says:
10. Turn on the water shutoff valves, run a hot water tap to
purge any air from the water lines and check the system
for any leaks.
11. Turn on gas, electricity, and remote control thermostat
and set the desired temperature.
12. Run hot water from several locations to check the operation
and performance of the water heater.
If you have difficulties please contact the Technical Service
Department at 1-800-432-8373 or your local service agent.

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http://www.palomatankless.com/owners/homeowner+trouble.lasso#28-11
The Controller displays error code "1L."
There is a build-up of lime in your Paloma.
Contact your plumber to service the Paloma by flushing out the lime.
Also search u-tube for flushing lime out of tankless.

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1 Answer

Main remote control is not working can you bypass the remote temporarily


No. However you may be able reset the thermostat to its factory setting.
Turn the thermostat off.
Shut of the gas and water supply to the unit.
Unplug or disconnect the unit from its electrical power source. Disconnect the thermostat from the heater.
Wait approximately 5 to minutes, and then reattach the thermostat wires to the heater.
Turn the water supply on and open the tub faucet to its hottest setting for about a minute.
Turn the faucet off and make sure no water water is flowing anywhere in the house.
Turn the gas supply back on.
Reconnect the thermostat wires to the heater.
Connect or turn the power supply back on.
Wait at least 2 minutes before turning the thermostat power button back on.
After the thermostat power button has be pressed, wait an additional 2 minutes before running water.
Test the heater at this time. Turn the water on at the farthest faucet to its hottest setting. measure the temperature with a cooking thermometer.
If you need to make adjustments to the water temperature, either up down, shut all the faucets off first.
The thermostat should read 100 degrees Fahrenheit when it first starts.
If you are receiving an error massage, consult with the manufacturer.
If the thermostat is reading the correct water temperature but the unit is not operating, there are other issue need to deal with. Let us know if this works or you need further assistance.


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Hi, its probably just the filter to the cold supply needs cleaning; these can get clogged from time to time. Turn your water off, remove unit, unscrew the water pipes which should be the silver flexi type and washout the mesh filters.
Hope this has helped.

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