HONEYWELL L7148F TROUBLE SHOOTING GUIDE

Start

Boiler is cold.

Boiler is not reaching proper temperature or will not tum on.

4,

Check:

L7t 48F Diagnostic LED =ON"?

I

Yes

Set room thermostat lO°above room temperature.

Set boiler 10° (or more) above current

water temperature. Boiler turns on?

-- No--

/No ___

Check for 12BY at LIX, L2X.

Check for 24V at R C

I

on L7148.

BoilerShort terminalsstarts? W-R (T-TW)

I

No

÷

Turn power "ON".

Check all wiring connections.

Replace transformer as appropriate.

Thermostat cr Thermostat widng problem.

Check system per instructions provided with thermostat.

___

Two Blinks:

Check sensor connections. If good, replace sensor.

L7148F Diagnostic LED, flashing?

Check:

 

Yes

_

Internal error,

replace L71 48F control.

_-_

 

Three or four

blinks:

 

 

 

 

I

Yes

 

 

No

 

 

 

 

 

 

I

i

 

 

 

Check for 24V,

at

81, B2?

I

 

 

÷

 

 

 

 

J

 

 

,

 

I

 

 

 

 

 

 

 

 

Check:

 

 

 

 

 

 

 

 

 

 

--

 

 

Yes

 

 

 

L7148F in reset mode (wait 5 minutes

 

 

 

 

4,

 

 

 

for control to

reset).

 

 

 

 

 

 

Check Circulator Pump, running?

 

Vent damper

apen?

 

L7148F is OK,

check ignition and gas

 

 

]

 

 

 

I

 

t

 

valve system as described in literature

 

 

provided with

those products

 

 

No

 

 

 

 

 

 

 

 

Yes

 

No

 

 

 

 

 

 

 

 

 

 

Check vent damper cable and

I_

t

 

 

 

ts it still set

 

 

 

connections.

 

 

Check room

thermostat,

at

 

I

Replace vent

damper cable or damper

 

10° above current

room

temperature?

 

Boiler shuts off at high limit setting?

I

as appropriate.

 

7'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

_r

Yes

No

I

120vacatC1,C27

 

L

No

!

 

4,

/

 

 

 

i

 

 

 

 

 

Y_s

 

 

 

Boiler shuts off above high limit setting?

L7148F

is OK

 

Check

other

system components:

 

 

 

 

Circulators,

Zone Valves

t

 

Yes

 

 

 

No (Below

HL)

Check:

 

 

4,

 

 

 

 

Temperature/Pressure

gauge

 

 

 

 

accuracy

 

 

Check L7148F diagnostic

LED Flashing?

Sensor fully inserted

into well

 

 

Thermo Well in good condition.

I

 

Thermo Well located per boiler OEM

 

recommendations.

 

No

_tNo

Replace L7148F.

Control failure, incapable of self diagnostics.

_r

IReset thermostat and repeat voltage check

i

I

4,

 

Yes

 

 

 

 

Check:

 

Two blinks, replace

sensor,

Temperature/Pressure

gauge accuracy.

L_ Three or four blinks,

replace control.

Thermo Well tocated per boiler OEM instructions.

34

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