Troubleshooting, Start up conditions, Thermal expansion – Maytag HE21250PC User Manual

Page 32: Strange sounds, Operational conditions, Smelly water, Air"\h hot water faucets, Rumbling noise, High temperature shut off system, Operational conditions ,33

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Start Up Conditions


Water supply systems may, because of such events as high line

pressure, frequent cut-offs, the effects of water hammer

among others, have installed devices such as pressure reducing

valves, check valves, back flow preventers, control

these types of problems. When these devices are not equipped
with an internal by-pass, and no other measures are taken, the
devices cause the water system to be closed. As water is heat­

ed, it expands (thermal expansion) and closed systems do not
allow for the expansion of heated water.

The water within the water heater tank expands as it is heated

and increases the pressure of the water system. If the relieving

point of the water heater’s temperature-pressure relief valve is

reached, the valve will relieve the excess pressure. The temper­

ature-pressure relief valve is not intended for the constant

relief of thermal expansion. This is an unacceptable condition
and must be corrected.

It is recommended that any devices installed which could create

a closed system, have a by-pass and/or the system have an

expansion tank to relieve the pressure built by thermal expan­
sion in the water system. Expansion tanks are available for

ordering through the Maytag Customer Service. Contact the

local water supplier and/or call Maytag Customer Service at

1-800-788-8899 for an authorized servicer for assistance in
controlling these situations,


Possible noises due to expansion and contraction of some
metal parts during periods of heat-up and cool-down do not

represent harmful or dangerous conditions.

Operational Conditions


In each glasslincd water heater there is installed at least one anode
rod (see parts section) for corrosion protection of the tank.
Certain water conditions will cause a reaction between this rod

and the water. The most common complaint associated with the

anode rod is one of a “rotten egg smell”. This odor is derived from
hydrogen sulfide gas dissolved in the water. The smell is thè result
of four factors which must all be present for the odor to develop:

a. a concentration of sulfate in the supply water.

b. little or no dissolved oxygen in the water.

c. a sulfate reducing bacteria within the water heater. (This

harmless bacteria is non-toxic to humans.)

d. an excess of active hydrogen in the tank This is caused by

the corrosion protective action of the anode.

Smelly water may be eliminated or reduced in some water heater
models by replacing the anode(s) with one of less active material,
and then chlorinating the water heater tank and all hot water
lines. Call Maytag Customer Service at 1-800-788-8899 for an

authorized servicer for further information concerning an Anode

Replacement Kit #66001068 and this Chlorination Treatment.

If the smelly water persists after the anode replacement and chlo­
rination treatment, we can only suggest that continuous chlorina­
tion and filtering conditioning equipment be considered to elimi­

nate the water problem.

Do not remove die anode leaving die tank unprotected. By
doing so, all warranty on the water heater tank is voided.




HYDROGEN GAS; Hydrogen gas can be produced in

a hot water system that has not been used for a

long period of time (generally two weeks or more).
Hydrogen gas is extremely flammable and explo­

sive. To prevent the possibility of injury under these

conditions, we recommend the hot water faucet be

opened for several minutes at the kitchen sink

before any electrical appliances which are connect­
ed to the not water system are used (such as a dish­

washer or washing machine). If hydrogen gas is pre­

sent, there will probably be an unusual sound simi­
lar to air escaping through the pipe as the hot

water faucet is opened. There must be no smoking
or open flame near the faucet at the time it is open.


In some water areas, scale or mineral deposits will build up on
your heating elements. This buildup will cause a rumbling

noise. Follow “Element Cleaning/Replacement” instructions

to clean and replace the elements.


The water heater has a high limit shut off system with a reset

button located above the upper element.

Follow the resetting instructions which refer to the high limit

behind the access panel.


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