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Scalding hot water

I have an obsolete Amana HTM Plus. I have some repair parts. I believe the three way valve in the heat exchange system may be faulty. I'm looking for two things. First, advise on how to proceed with this hot water problem. Second, I'm looking for any documentation on the Amana HTM Plus, schematics or manuals, anything that will help maintain this system.

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If your water is too hot, then either the water tank thermostat or the wiring to the indoor unit is defective. When the water reaches the set temperature, then the tank thermostat contacts should open up and shut off the combustion unit. If the combustion unit does not shut off, then check all wiring and relays. A manual is located at

Posted on Apr 07, 2010

  • enb54 Apr 13, 2010

    Just helped a friend, used Honeywell V8044A1044 diverter valve, use Google and you'll find one for a reasonable price, remember to operate it to 'manual' when soldering, or you'll destroy the valve through overheating.

  • enb54 Apr 16, 2010

    I just learned last night that tha actual correct (Amana replacement) diverter valve is a Honeywell V8044E1052


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It sounds to me like it's got a bad mixing valve,,this would be on the hot side with a turn know on top with 1 cold feed and one hot feed then the line going to the faucets {house} side, if it had the know on top you can adjust it, look on it it will have arrows on it saying hot-cold turn to the cold side, if not you may need to replace the mixing valve

Posted on Jun 06, 2009


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Hot water heater has hot in tank but dose not come out of hot water line on tank

most electric hot water systems use a heat transfer process where the element is in one tank and the house water is in another
the house water is what is being drawn off when you turn on a tap
there is a regulator valve at the top of the tank with a small lever that you open up to let water in and air out of the system
another point is that there may be a hot/cold mixer on the hot water outlet which limits the temperature of hot water to prevent scalding injuries in the bath and shower or sink
If you have one fitted they are known to malfunction and cut the hot water temperature down as, they mix too much cold water into the hot water pipe.
have a plumber check it out

Jun 13, 2015 | Water Water Heaters

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Hi Mustafa, you are going to need a Gas Engineer to fix this one. It could either be the Hot water sensor or the flow switch that activates the water to come on. Good Luck.

Jan 03, 2015 | Water Water Heaters

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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:

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.

Sep 21, 2011 | RTO Paloma 7.4 Series Ph28 Outdoor...

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Takes a long time to get cold water. Then it is still luke warm. New house. Unhook it, and you get plenty of cold water. Takes forever to get hot.

Open water heater drain valve or TP valve to see if unit is producing hot water.
Protect yourself from scalding water.

If water heater is not working, then call service technician, or re-post question on fixya with type of water heater, description of water heater and brand, and what you have done so far to repair problem.

If water heater is working, then you probably have crossover problem at recirculation system check-valve or at single-handle faucet. Or both.
Remove check valve and clean with white vinegar; replace defective single-handle faucet cartridge.
Open following links for resources

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I am not getting any hot water, only cold water, when I run my hot water taps. I have an Ariston Bravo water heater. Normally I have permanent hot water at any time. My central heating seems to be...

Sounds like the by-pass valve diaphragm. This valve detects that hot water is being drawn off at the tap and then diverts the mains input water across the heat exchanger. Very often it's the diaphragm inside the valve which is punctured or split.This can be replaced [depending on model] if you take apart the valve
. Remove the front panel and lower the control panel.The valve is at the bottom left of the boiler
Suggest turning off the service taps to the two heating pipes and the cold mains inlet pipes before tackling the valve

Mar 20, 2010 | Water Heaters

1 Answer

Baxi duotec is heating radiators but not tap water? Has been deteriorating for weeks. needs TWO taps turned on to get hot from one! powerflush help? been told its sludge in heat exchanger?

Sludge / furring possible in primary part but not if the ch & flow through hot tap are ok More likely it's the diverter valve. The rubber diaphragm inside is perished / holed. Replace

Oct 27, 2009 | Protech Systems FasNSeal FSWMKE4 4" Vent...

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Alpha 240e boiler wont fire up for hot water, will for heating

most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up

Aug 21, 2009 | Water Heaters

1 Answer

Radiator heats up when running a shower.

Your boiler is overdue for a service.

Combi boilers are unlike regular boilers in that they have quite a few moving parts, it's vital that these are serviced annually if you want the boiler to remain reliable and to avoid expensive failures.

In your case, the diverter valve has most likely failed. Normally, when the heating is on this senses when there's a demand for hot water and temporarily diverts the primary hot water circuit to feed the domestic hot water heat exchanger. When the demand for hot water ceases the primary hot water circuit is diverted back to the central heating heat exchanger. The valve has a number of moving parts including a rubber diaphragm which can wear out and split and moving shafts which can seize.

When the valve fails it can leak and also can divert hot water to the central heating heat exchanger when hot water is used. The reason that only the highest radiators in the system are affected is probably because the failed valve does not necessarily cause the central heating pump to activate and circulate the hot water throughout the system (it does on some boilers though). If hot water is introduced into a cold heating system it will rise via convection to the highest points in the system like an old fashioned gravity circulation system which was unpumped.

Call a heating engineer out as soon as possible; I'm not going to advise how to do the repair yourself as gas appliances MUST be serviced by qualified persons only for reasons of safety. If you're lucky then the valve simply needs cleaning up and a few new diaphragms plus other minor seals and rings. If it's gone too far then the valve and possibly the manifold it's attached to will need to be replaced.

In the UK the part alone typically costs between £100 to £200 depending on whether it's just the valve or the manifold as well. The diaphragm kit typically costs up to around £15 and is routinely fitted when the boiler is annually serviced, and a new valve will already have new diaphragms fitted. For a routine service expect to pay for up to two hours labour (many can be done in one hour), but if the valve/manifold have failed it will be longer as one failure often causes other parts to need further inspection/repair.

I hope that I've helped you today, if so please return the favour by rating my answer.

Jul 10, 2009 | Whirlpool Aquatic Millennium VII -...

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I've got a pressure problem on my glow worm 35ci combi boiler

check to see if you have a mid position valve or a 3 way valve
the mid position will give hot primary supply to both your hot water cylinder and your heating circuit if both stats are asking for heat.
you cant really get spares for these type of valves you are probably better off changing it if it is causing problems.

Mar 28, 2009 | Water Heaters

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