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Burners on tankless Paloma PH-12m-Dn don't burn hot enough to heat the water

Opened water valve. The extra water flow got the burners to turn on. Also turned on all hot water in sinks (3ea) and both showers.

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  • Water Master
  • 9,324 Answers

Check the flame color when it's on. Blue tips are correct. If the tip is orange or any other color but blue, the air mixture is out of adjustment. Check the owners manual for instructions on making this adjustment

Posted on Nov 19, 2014

  • Jose
    Jose Nov 20, 2014

    Lawrence, I checked the the tips and they are blue. They used to burn like a blow torch, but now they are weak. I'm not sure what my next troubleshoting step would be....not trying to call in a plumber just yet.

  • Lawrence Oravetz Nov 20, 2014

    Check the gas pressure regulator that supplies gas to the heater. Sounds like it isn't doing it's job like it used to.

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SOURCE: Paloma Tankless water heater wont kick on

Tankless Water heaters have a automatic pilot and digital water temperature control system; you have to turn on the water in the house to get it to kick on that is unless you have a circulation pump on a timer. If the gas supply doesn't have atleast a 2" rating that with cause the tankless to malfunction because it's not getting enough gas pressure; certified professionals rarely make this mistake. Moreover, if you don't have a water softener you are using with the tankless you voided your warranty; the minirals clog the heat exchanger.

Posted on Nov 28, 2008

Da Brain
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SOURCE: On demand, tank less water heater

THE WATER IS RECIRCULATING IN THE UNIT. MAYBE CAUSED BY THE ACID. TRY INSTALLING A BACK FLOW PREVENTER

Posted on Oct 27, 2008

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SOURCE: BOSCH AQUASTAR 2400ES NATURAL GAS TANKLESS HOT WATER HEATER

Q. FA - Gas leakage error, gas valve circuit not closing properly
A.

  1. Disconnect power supply cord and check wire connections on gas valve and the two connectors on the control board.
  2. Flow water out of a hot water tap above the minimum activation point of .8GPM. Measure voltage at the gas valve wire connector. The connector should measure 24VDC between the left pair of wires and 24VDC between the right pair of wires when the unit is operating. If voltage is not correct, contact Bosch Water Heating for further instruction.
  3. Gas valve may be defective, contact Bosch Water Heating for further instruction.
Q. EA - No flame ionization detected with water flow
A.
  1. Verify that all manual gas shut off valves are open.
  2. Verify gas type (See Fig. 2 in installation manual) corresponds with the type of gas supplied to the heater.
  3. Reset error code and open a water tap to cycle the heater in an effort to purge air from gas line (especially on new installations). Cycling hot water tap on and off multiple times may be necessary. If heater still faults with EA error code, have a licensed gas technician properly purge air out of the gas line leading to the water heater.
  4. Verify the three yellow wire connections to the set of electrodes (underside of the burner assembly) are secure.
  5. Verify gas pressure meets specifications outlined in chapter 3.8. See Bulletin TWH-G2-03.
  6. Verify venting meets specifications outlined in chapter 3.6 of the installation manual. Improper venting may cause premature failure of the flame sensor rod.
  7. Observe inside the viewing window of the heat exchanger when a hot water tap is opened. Sparking should be followed by a steady blue flame. If not, Call Bosch Water Heating with observations. Readings from above gas pressure test will be required.
Q. C1 - Fan rotation too low on startup
A.
  1. Disconnect power supply cord. Check wire connections on back side of fan and the two large wire connectors on the control unit. Removal of lower access panel on control unit is necessary to access connectors.
  2. Verify that supply voltage is 120VAC and is properly grounded.
  3. Verify that venting meets specifications outlined in chapter 3.6 of the installation manual. Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure. Verify backdraft flapper inside flue gas collector is not stuck shut.
  4. Check gas pressure. See Bulletin TWH-G2-03. Low gas pressure may cause the fan to change its speed to meet desired temperature.
  5. Possible defective control unit. Call Bosch Water Heating for further instructions.

Posted on Mar 15, 2009

gary1121
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SOURCE: Paloma PTG 74PVN Tankless Water Heater

did you check the filters on the the water valves, i am not exactly sure about your codes that are shoeing but if you could read it and post them, i know on some of the units 76 means there is low water pressure and the filters are behind 2 caps one on each side above the shut off valve take off the caps and remove the screens, clean them and replace them ,, make sure you turn off the water on both side first or you will get wet

Posted on May 29, 2009

  • 6 Answers

SOURCE: Noritz tankless water heater/dishwasher not hot enough to clean

You are doing everything you can. Your dishwasher probably isn't drawing enough hot water to activate the unit so opening the faucet and flowing more water will activate the unit. Just try to adjust the flow from the faucet to a point it, plus the draw from the dishwasher, will activate the unit. This will come with trial and error as I am sure you have already experienced. Also, open the dishwasher when it does get filled and check the water temperature. You might have the unit set at a low discharge temperature. Do you have a touchpad to control the water temperature adjustment?

Posted on Jun 10, 2009

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1 Answer

I have an old Paloma PH-12M-DN tankless gas water heater. I have water flow on the inlet side, but no water flow at all coming out of the outlet side. What might the problem be?


the tank must fill before you will get any flow from the outlet.that will take some time before you get anything out. how long depends on the size of your tank.hth jq

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I have a Model PH-28ROFN. The control pad reads 120 as it always has. When I turn on the faucet the code C2 11 flashs in sequence. No hot water is available. Any ideas please. Jerry Averill


Before calling service technician, Open following link for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C2 11 is no ignition.
Do-it-yourself solution can include: clean burner parts and combustion chamber, clean air intake, realign igniter and sand carbon off igniter.
Other causes can be combination of factors.
Factors including improper grounding, incorrect outlet polarity, bad igniter, bad gas solenoid, low gas pressure, wrong gas, gas valve partially shut off, air in gas line, bad venting, loose wiring, bad sensor, bad PC-board, etc.

The product manual recommends yearly service.
Yearly service should include checking/testing each item mentioned above, plus checking that temperature is not set too high for volume of water used, checking for water softener, plus checking if acidic vent condensate is correctly flowing into household drain and eventually out to sea instead of dripping into heat exchanger causing expensive alloy to rust, crack and fail.
Other periodic maintenance includes de-liming the heat exchanger yearly, and cleaning water filter monthly.

Repair most tankless problems yourself, same day, all brands for $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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Heats up the rapidly decreases within in minutes.


Problem new or old? How long you have unit? Sounds like not enough flow to keep burner on. Tankless need at least .6 gpm to keep hot water flowing or else the burner fires then shuts fires then shuts and you get a sandwich effect...hot cold hot cold. If you have new diverter valve in shower -vs- old two handle type try turning hot water ALL the way ON and see if hot stays hot. If it does stay hot then slowly adjust to cool and see if you maintain a good MIX for proper temp. If it goes cold again try this......LOWER control pad setting to a comfortable 105 degrees (ladies) 100 degrees(men) and turn shower valve all the way to HOT. See if your temp remains consistant now and if it does then problem solved. Tankless mindset...set temp on control pad and stop trying to MIX at shower valve. Thats how these things work. Thats why I install a control pad in each bath and one in the kitchen for adjusting ash temp during dishwasher on time. ditto for wash machine. You should never need to turn on cold water if your unit is set to proper temp at controller. Hope this helps

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Paloma tank less water heater flashes code C4 13 and we have no hot water?how to fix it?


I had the same problem with my Paloma a year and a half after installation...contacted Rheem customer service (800-432-8373) and they recommened a local installer in my area. The technican diagnosed the problem as the "flow control valve"; he managed to get Rheem/Paloma to cover the part under warranty...I only had to shell out the money for the install.

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Richman gas lp tankless hot water heater. used for infloor heat and kitchen and bathroom hot water. getting c2 and 11 error code. water temp. setting 120. ran great last year. made no changes. we have very...


I had the same problem with my Paloma a year and a half after installation...contacted Rheem\Paloma\Richman customer service (800-432-8373) and they recommened a local installer in my area. The technican diagnosed the problem as the "flow control valve"; he managed to get Rheem/Paloma to cover the part under warranty...I only had to shell out the money for the install.

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Burners will not disengage after shutting off Hot Water.


Ok the way this system works is from a pressure and flow switch. The pressure switch picks up the slight drop in pressure when the hot side water is turned on then turns on the burner. The flow switch measures the amount of water flowing and adjusts the size of the burner to the amount of water flow. So a couple different things might be happening. The flow switch might be sticking causing the water heater to throttle down the burner but not off when the water flow is off. Or the gas control valve might be by-passing gas when off causing the burner to stay on even when the demand is off. Run the hot water on high demand then turn the water off. If the burner is still on try banging on the water heater with your hand and see if the burner shuts off completely. If it does the gas control valve might be by-passing. You would also need to check and see if the pressure/flow switch is giving any voltage signal changes when the water flow is off. These tankless water heaters are more comlplicated to work on than a standard water heater and you may need a professional's help...good luck

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I'd initially check for a cross connection (cold water leaking into hot water system). This can be done by shutting off the cold water feed to the tankless unit, then opening up hot water fixtures around the home. You should see the water come to a complete stop; if you see a steady stream of water, then you have a cross connection. The most common place for a cross connection is at single handled showers. The valve cartridge starts to fail over time.

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Paloma Tankless water heater wont kick on


Tankless Water heaters have a automatic pilot and digital water temperature control system; you have to turn on the water in the house to get it to kick on that is unless you have a circulation pump on a timer. If the gas supply doesn't have atleast a 2" rating that with cause the tankless to malfunction because it's not getting enough gas pressure; certified professionals rarely make this mistake. Moreover, if you don't have a water softener you are using with the tankless you voided your warranty; the minirals clog the heat exchanger.

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