Honeywell L7224U1002 Guide d'installation télécharger pdf (Page 11)

L7224U OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT

CONTROLLER

11 69-1720EFS—07

Table 10. Troubleshooting Guide

Refer to Table 3 for Display and LED locations.

ZC LED ON indicates ZC terminal power is OFF.

ZC LED OFF indicates ZC terminal power is ON.

System Condition Diagnostic Condition Check Action

Boiler is cold, house

is cold.

Display is OFF. 120 Vac system power. Turn system power on.

Display is ON.

TT-LED is OFF.

24 Vac T-T. No 24 V; replace controller.

Display is ON.

TT-LED is OFF.

24 V present; disconnect

thermostat, short T-T.

Boiler starts, check wiring and

thermostat.

Display is ON.

TT-LED is ON.

B1 LED is ON.

120 Vac at B1-B2. • If no, replace controller.

• If yes, check burner and

wiring.

Display is ON.

TT-LED is ON.

Refer to Err on display. —

Boiler is hot, house

is cold.

Display is ON.

TT-LED is ON.

C1 LED is ON.

120 Vac at C1-C2. • 120 Vac at C1-C2, check

wiring to pump.

• Wiring ok, is pump running?

If not, replace the pump.

• If pump is running, check for

trapped air or closed zone

valves.

Display is ON.

TT-LED is ON.

C1 LED is OFF.

ZC LED is ON

Boiler below the Low Limit

temperature, wait for boiler to

go above Low Limit

temperature.

—

Display is ON.

TT-LED is ON.

ZC LED is OFF

Boiler above LL? If yes, check

for 120 Vac between ZC and

L2.

• If no 120 Vac, replace

controller.

• If yes, check zone relays,

circulators and wiring.

Boiler is hot, no hot

potable water

Display is ON. Boiler Demand signal from the

water heater (either 120 Vac at

ZR-L2, or 0 Vac on T-T;

depends on installation and

“duu” setting)

• 24 Vac on T-T (or 0 Vac on

ZR-L2), check wiring to

water heater

• Wiring OK, check the water

heater

"Zr" reads "On" (or "tt" reads

"On")

• “Zr” reads “OFF” but

120Vac on ZR-L2, replace

the control

“duu” setting • Set duu to ON if 120 Vac

water heater demand is

connected to ZR

• Set duu to OFF if open/

closed water heater

demand is connected to T-T

Check DHW Module and DHW

Sensor

• DHW Module not properly

connected and/or DHW

Sensor improperly

positioned

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Honeywell L7224U1002 Guide d'installation Page 11

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