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Troubleshooting cental heat unit

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Check line voltage if good then controlle volts that is 24 Ac smell the transformer clean draft hood, burners, fan assembly and filter. Call for heat if nothing check for 24 volts at gas valve if good change thermlocuple. Need more help ask give more info about furnace and what its doing or not doing

Posted on Sep 01, 2016


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Posted on Jan 02, 2017


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Heat isn't working

Copy following links:

Look at label on side of unit, and add comment March 2013, and say what brand and type water heater that you have.
Information above does not apply to boilers, or other brands tankless.

Mar 07, 2013 | Water Heaters

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No hot water,central heating is fine

Sounds like the output fitting has melted inside and clogged up the output pipe. These couplings are one way valves to keep water from draining backwards when not in use to keep from burning elements. They are plastic inside. I would turn off water and replace those after a visual inspect if needed.

Feb 20, 2013 | Water Heaters

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I have a Rheem rtg 74dvp but its not heating and the display show me 1 76 and 2 76, and come all the time to 76 F and another times its blinking the temperature, but not heat

Error code 76 is communication problem between remote control and tankless unit.
Multiple error codes could indicate that main PC board is bad.
Before calling service technician, open following link for troubleshooting resources including link to Rheem chat, manuals, error codes, etc.

Jul 15, 2011 | Rheem Tankless Water Heater RTG-74DVP...

1 Answer

Can't isolate central heating from hot water

What is the basic problem and objective?
Are you trying to isolate the water heater vent from the heating unit vent?
Are you trying to isolate the gas lines because furnace is drawing too much gas and water heater will not work?
Or is your tankless being used for spacing heating also?
Why are you trying to isolate?
Before calling service technician, open following link for Bosch troubleshooting resources:

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 01, 2011 | Bosch Water Heaters

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I have a Reliance 501 electric water heater. There are two panels. In the top panel is a red "reset" button. On two occasions this button has popped and turned off the unit. I have pushed the...

ECO reset button trips when thermostat senses high heat event over 150 degrees F, or when upper or lower thermostat is defective. There are other causes: if tank access covers and insulation are missing, and when element is shorted to ground in center of element so that element continues heating through one leg of 240V circuit after thermostat turns off.

Ordinary tank-type electric water heater is fully repairable by homeowner using generic parts from hardware store or home center.

1) Replace upper and lower thermostat for about $28, and if problem persists, then do troubleshoot shown in step 2 below.

2) Take 30 minutes and troubleshoot before replacing any parts.
Troubleshoot requires cheap multimeter from home center.
Install battery in multimeter.
When testing voltage, rotate multimeter dial to 240 or 250 or 277 VAC.
When testing continuity or elements, rotate multimeter dial to ohms (upside down horseshoe symbol is ohms)


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Temp keeps fluctuating

sounds as though it could be a cental heating thermistor prob, you dont say wheather its the boiler unit or the remore programmer?

Dec 02, 2008 | Water Heaters

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