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Hot water boiler

Looking for a manual on honeywell hot water boiler for a house

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Contact honeywell with right model no. and they should be able to help or try online on honeywell website.

Posted on Dec 12, 2007


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Posted on Jan 02, 2017


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Honeywell technical support

This boiler, from memory, has an electric diverter valve.
If the system has dirty (sludge/scale laden) water then the diverter valve may not return under spring pressure, and therefore not divert all of the hot boiler water to the hot water heat exchanger, leaving some going to the rads.
If I am right then the rads will not get fully hot.
If the valve has failed completely, or electrically, then the rads will get fully hot and there will be no hot water output (hot water will be cold).

Aug 19, 2014 | Heating & Cooling

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Came home after a weekend away and central heating not working. Programmer not turning heating on (honeywell st6400c) but the boiler (a sentima ht 60l) looks like it has a fault. The mains light us on but...

Possible cause of lockout: boiler low water level. If you have a combination temperature/pressure gauge, it should read approximately 12 psi when the boiler is cold. When it runs, it will be approximately 22 psi. If the pressure is low feel the inlet water supply piping. Open the manual feeder valve. The cold water coming in will verify that there is no obstruction to the water flow. You may have "dirt" in the line. You may have a defective water pressure valve or check valve. Another thought. Make sure your AIR SEPARATOR is functional. Remove the cap and depress the valve. You should see water. If air comes out, continue to"bleed" the AIR SEPARATOR. You may haven't to replace the A/S.

Jan 28, 2013 | Heating & Cooling

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My Honeywell ST 6400C won't heat the hot water the light comes on but pump doesn't run or boiler fire. But does work on C/Heating.I can get hot water only by running the C/H and manually opening the hot...

it sounds like the motor in the motorised valve is not working on some models you can just change the head /motor , check cylinderstat (hot water stat) is working

Dec 14, 2010 | Honeywell Heating & Cooling

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I have a Honeywell ST499A/ST699B "Central Heating Microelectronic Time Controller" managing the operation of my house boiler. The time controls are set properly. PROBLEM: If I want either hot water or...

I have an old Honeywell ST499A/ST699B thermostat. It still works OK but when we have a power cut I have to re-programme everything. Presumably this is because the battery needs replacing. I cannot find a way of opening the control box to get into the unit to replace the battery and in any case I’m not sure if the battery is renewable?

Oct 12, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Boiler is a baxi control for heating is honeywell.

this will be your diaphram inside your divertor valve.
the one that looks like a spaceship.
it will e split.

Oct 05, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell ST6400C - hot water not working

some digital thermostats do no not work with zone valves is this a new thermostat that you had installed

May 08, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

When i turn heating or hot water on fuse board trips

it was a faulty heating pump. replaced, all ok now.

Jan 03, 2009 | Honeywell Electronic Programmable...

1 Answer

Honeywell ST6400C programmer

Hi yes sound like it not working on hot water only it would check ou the wiring on this side

Jul 25, 2008 | Honeywell Programmable Thermostat Heater

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