Armstrong 3401 Manuale di installazione e manutenzione - Pagina 18

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Troubleshooting

Fault Diagnosis

Read the section "Important Safety Information" first.

If any maintenance is required then it must be carried out by a competent tradesperson. Before replacing any parts

make sure that the underlying cause of the malfunction has been resolved.

Warning! There are no user serviceable components beneath the casing of the appliance. Only a competent

tradesperson should remove the cover.

Symptoms

1. Only hot or cold water from

outlet.

2. No flow from Mixing Valve

outlet.

3. Mixed water temperature

at TMV outlet fluctuates

and does not respond to

adjustment.

4. Hot water in cold supply

and vice-versa.

Probable Cause

a. Inlet supplies reversed (i.e.: hot to cold

or vice-versa)

b. No hot water available from hot water

source.

c. Screen/filters occluded or inlet supply

fittings plugged.

d. Refer to Symptom 4 below.

e. Proportioning mechanism (Cartridge)

trapped against hot/cold seat.

a. Hot or Cold inlet supply failure;

Thermostat holding correct shutdown

function.

b. Screens/filters blocked or inlet supply

fittings plugged.

a. Thermostat not operating correctly.

b. Mixing Valve operating below minimum

required flow rate.

c. Static inlet supply pressures beyond

valves capability to correct.

d. Inlet supply pressures fluctuating

beyond valves capability to correct.

e. Hot water supply temperature

fluctuating beyond valves capability

to correct.

f. Partially occluded screens/filters or

partially blocked inlet fittings.

a. Indicates non-functioning check valve

(s).

Check-Rectify. Tip: Check rear of valve

under polymer mounting plate for

raised "H" (hot) on appropriate inlet. If

sight evaluation is not possible consult

factory Technical Support for additional

diagnositc tips.

Check-Rectify

Refer to Servicing/Maintenance - Rectify.

Refer to Symptom 4 below.

Refer to Servicing/Maintenance.

Check-Rectify.

Refer to Servicing/Maintenance - Rectify.

Replace Cartridge.

Check that at least 2 GPM is flowing

through valve.

Check-Rectify

Check by carefully sensing inlet hot

supply pipe work- rectify.

Refer to Servicing/Maintenance - Rectify.

Diagnose by turning off mixed water

outlet flow and check to see if inlet hot

pipe work becomes cold and vice-

versa.

Possible Remedy

(contd...)