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My water heater blower turns on over and over then the unit shuts down and says loc

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It is a hybrid,it will run when it wants to get water up to temp,loc is so settings dont get changed

Posted on Apr 16, 2015

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Recently, the unit will shut down and I have to reset the system. The blower kicks on and then the ignitor and it will work fine for a few days and then I will have to repeat the process.


Had a similar problem with my boiler. Turned out the blower was bad, was running too fast, and the system was shutting down with an error message. Was expensive to replace.

Sep 22, 2015 | Water Heaters

1 Answer

Flammable sensor is lit and won't go off. I replaced the sensor how do i reset the controller?


Certain water gas water heater models feature electronic controls with a flammable vapor sensor installed on the bottom portion of the water heater unit. This sensor is designed to shut off your water heater system to prevent fires in case flammable vapors are present within the area. If your flammable vapor sensor caused your water heater to shut down, check the area immediately for leaking gas or other flammable products. Common household chemicals such as bleach can also trip the safety system as well as unsuccessful burner ignition attempts. I'm not sure what control your unit has, but on a White Rodgers here's how it goes.


White Rodgers Intelli-Vent PowerVent Control Equipped Models
  1. Step 1 Turn the water heater's blower switch off and disconnect the power cord for the water heater (refer to your particular model's operation guide for the exact location of the blower switch). Disconnect the Molex connector attached to the bottom of the control pad (the left most connector with five pins).
  2. Step 2 Turn on your multi-meter and set it to read resistance or "ohms". Connect one of the multi-meter's probes to the number two pin and the other probe to the number three pin of the Molex connector (middle black wires). If the reading on your multi-meter reads below 9k or above 45k ohms, the flammable vapor sensor is faulty and in need of replacement; you cannot reset the system until this issue is resolved.
  3. Step 3 Reconnect the Molex connector to the bottom of the control pad, reconnect the water heater's power if and turn the blower switch to the "ON" position. Press both the left and right buttons on the control pad at the same time. Wait for the green light on the control pad to blink and press the following buttons in sequence: Left, Right, Left, Left, Right, Left, Right, Right (you will need to perform these actions within 30 seconds of reconnecting the power cord to the water heater in order to be successful

Oct 15, 2010 | Audiovox Richmond 6G40-36F 6-Year Tall Gas...

1 Answer

Basement was flooded when washer inlet hose burst. Approx 6 in of water in the area where the water heater stands. Complaint of no hot water, no pilot flame. Attempt to light pilot successful but pilot...


Certain Rheem water gas water heater models feature electronic controls with a flammable vapor sensor installed on the bottom portion of the water heater unit. This sensor is designed to shut off your water heater system to prevent fires in case flammable vapors are present within the area. If your flammable vapor sensor caused your water heater to shut down, check the area immediately for leaking gas or other flammable products. Common household chemicals such as bleach can also trip the safety system as well as unsuccessful burner ignition attempts.


White Rodgers Intelli-Vent PowerVent Control Equipped Models
  1. Step 1 Turn the water heater's blower switch off and disconnect the power cord for the water heater (refer to your particular model's operation guide for the exact location of the blower switch). Disconnect the Molex connector attached to the bottom of the control pad (the left most connector with five pins).
  2. Step 2 Turn on your multi-meter and set it to read resistance or "ohms". Connect one of the multi-meter's probes to the number two pin and the other probe to the number three pin of the Molex connector (middle black wires). If the reading on your multi-meter reads below 9k or above 45k ohms, the flammable vapor sensor is faulty and in need of replacement; you cannot reset the system until this issue is resolved.
  3. Step 3 Reconnect the Molex connector to the bottom of the control pad, reconnect the water heater's power if and turn the blower switch to the "ON" position. Press both the left and right buttons on the control pad at the same time. Wait for the green light on the control pad to blink and press the following buttons in sequence: Left, Right, Left, Left, Right, Left, Right, Right (you will need to perform these actions within 30 seconds of reconnecting the power cord to the water heater in order to be successful

Oct 01, 2010 | Rheem Water Heaters

1 Answer

The hot water shuts down for a few minuts then


your unit is undersized or you do not have enough gas supply to run the unit properly.
If you have to many water features running or you have to many gas items turn on at the same time it can cause problems.

Apr 10, 2010 | Rinnai Water Heaters

1 Answer

Blower not turning on


push the priority button unplug the unit for 1 min,, plug it back in set the temp to the lowest setting it has to start on the lowest setting turn on a faucet on the hot side, turn it on set the temp after it comes on and it should stay on,, if not check the vent make sure there is nothing around it on the outside it can not have anything blocking it,, all the flue connections have to be in the same way they lock into position and it can determin thru the computer if they are not together it draws in the exhaust fumes and shuts it self down

Apr 10, 2009 | Rheem Tankless Hot Water Heater...

2 Answers

Rheem powervent2 water heater not starting


I am guessing that their is a flag control(switch) in the airstream of the vent and it is now stuck in the closed position due to the snow, maybe. Find the flag switch and make sure it can move freely. It must move freely for the venter fan airstream to operate or move it.  

Jan 24, 2009 | Water Heaters

1 Answer

The power vent blower on my hot water tank will not shut off.


If the blower continues after the end of the burn cycle it is the cool the heater down. Over running would indicate a defective end cycle temp relay.

Good Luck, Phil

Nov 14, 2008 | Water Heaters

2 Answers

Bosch gwh-425ef nat gas on demand heater


sound like pcb board is failing - control board

Nov 09, 2008 | Bosch & Power Vent Water Heater

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