Page 14 – Dunkirk Hotline Indirect Water Heater User Manual

Page 14

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Page 14

Circulator does not

operate

Check aquastat setting

PROBLEM

CAUSE

SOLUTION

Boiler does not

operate

Refer to boiler installation

instructions

Check main service switch

Check fused disconnect

Peak use of hot water

is greater than tank

storage capacity

Determine peak usage,

compare to tank capacity,

and add additional storage

(storage tank) if necessary

Improper aquastat

setting

Turn tank aquastat to safe

temperature setting

Electrical problem

(relay, wiring, etc.)

Check fuse and replace

Check circuit breaker and

reset (if applicable)

Check power supply

Aquastat set too low Raise aquastat setting to

safe level. See Section III

Undersized boiler with

no priority to

domestic hot water

Rewire for priority

No hot water at faucet

Water at faucet too

hot

Aquastat set too high Lower aquastat setting to

safe level

Tempering valve not

properly set or

defective

Check manufacturers

instructions

Scale build-up

If boiler, circulator, and tank

are operating satisfactorily,

coil may have scale coating.

See Section VI for tank

flushing procedure.

Check power supply

Replace as necessary

Faulty tank aquastat

Replace aquastat

Boiler cycles more

than 5 times per day

during hotest months

Excessive demand

Reduce demand or consider

larger tank

Faulty aquastat

Replace aquastat

Boiler high limit set

too low

Increase boiler high limit

setting

Insufficient hot water

Rust staining; bad

taste and odor in

water

Iron/minerals in water

supply

Filtration

Scale, hard white

particles from faucets,

popping sound from

tank

Lime, water hardness

above 7 grains-

120ppm

Water treatment; softener;

etc.

Rotten egg odor

Hydrogen Sulfide

Flush tank with chlorine

solution and install

alumninum anode rod(s)

Air from hot water

fixture

Electrolysis or air

introduced by water

supply

Properly ground heater &

replace anode rod(s). Check

well pump system.

Reduction in recovery Dip tube broken or

compromised by high

chlorine in water

Replace dip tube

Inlet/Outlet fitting

corrosion

Galvanic corrosion of

dissimilar metals

Install dielectric unions

T&P gushing water

Excessive water temp.

(above 210 °F)

Adjust or replace aquastat

and T&P valve

T&P Valve dripping

water

Excessive water

pressure (above 150

psi)

Check incoming water

supply pressure; closed loop

system (System Plus)

requires expansion tank

SECTION VI: TROUBLESHOOTING

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