TS-15: DHW not hot enough

Is this a combi boiler or an indirect water heater tank?

Combi Boiler IWH tank type
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#B5

Is the water temperature hot when faucet is first turned on and than cools off or not hot enough when faucet is first trned on?

Not hot enough when first turned on Hot than cools off
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#B9

Is this a new installation and problem during start-up or existing boiler?

New Installation Start-up Existing Job
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#B16

You are in the wrong section. Please go to tank type.

IWH Hot Water Tank Problems
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#J5

Enter password using 86

Next Directions on entering password
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#H16

Enter the DHW menu

Next
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#M16

Verify the “Domestic Hot Water Type” parameter is set to “Tankless”. If not choose tankless.

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#Q16

Press the right arrow key and verify the “DHW Setpoint Temperature” is “170 – 180”. Turning to 180 will start with hotter water.

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#V16

Press the right arrow key and verify the “DHW Diff Above” is at least 10f

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#AB16

Press the right arrow key and verify the “DHW Diff Below” is at least 5f. If it is you may try turning it down to 2f. Do not turn this below 5f unless you turn the DHW Setpoint temp up to at least 175f.

Next
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#AH16

Verify the setting on the mixing valve is set to 120f to 125f.

Next
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#AN16

Replace mixing valve

Done
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#AP21

Call Tech Services

Done
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#AN32

Is the temperature of the hot water at the faucet at or near the setting on the mixing valve?

Yes No
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#AT16

Is the temperature of hot water leaving the plate heat exchanger and before the mixing valve higher than the setting on the mixing valve?

Yes No
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#AT21

Does the flow at the faucet exceed these rates for the combi?
K2-150………3.5 gpm
K2-180………4.4 gpm.

Yes No
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#AT28

Add a flow restrictor on the inlet side of the combi to have faucet flow meet spec.

Done
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#AT35

Is the inlet water temperature a minimum of 50f?

Yes No
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#BA21

The combi can supply a rise in yemperature of 70f to 77f. Reducing the flow below 3.5 for the K2-150 or less than 4.1 for the 1K2-180 will supply higher temperature water at a lower flow rate. Storage may be required.

Done
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#BA28

Directions on entering password

  1. Follow the steps below.
  2. Press the “Adjust” button twice
  3. Press “Login”
  4. Press the “Zeros” on the screen
  5. Type 86
  6. Press the return key on the right 8
  7. Press “Save”
  8. Press “Adjust”
  9. You will now see 6 rectangles on the screen. The lower right box will be “More”, pressing that will take you to the next page of menus. Pressing the “X” in the upper right hand corner will take you backwards.
  10. Any screen you make changes to may have a Checkmark √. That would mean save the change. If you leave the screen and have made a change and did not press the checkmark √ it was not saved. Not all screens will have a checkmark √.
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#A93