Hydrolevel 3150 User Manual download pdf (Page 9)

YES NO

Is the

Thermostat

(T-T) Calling

for Heat?

Is There

120 VAC

Between B1

and B2?

Is the

External Zone

(ZC-ZR) Calling

for Heat?

Is the

Low Limit Dial

Set to OFF?

YES

Is the

Red LED

On?

The Control is

Sensing

Low Water.

Is the

Yellow LED

On?

The Control is

Sensing High

Temperature.

If both the red and yellow LEDs are off and there is a call to

fire the burner, there will be 120 VAC on terminals B1 and B2.

 If 120 VAC is not present, the control should be replaced.

HydroStat is supplying 120 VAC to the burner circuit.

 Recheck wiring and operation of burner and other limit controls.

The Control

is Operating

Properly.

Replace

Control

The burner will not fire until the boiler water has dropped to the

high limit differential set-point. See HydroStat Settings chart.

 Check that the high temperature setting is correct.

Troubleshooting Flow Chart 1 – Burner Will Not Fire

YES

Is the

Green LED

(TEMP ACTIVE)

On?

The Control is

Not Powered.

The Temp Active LED will be on at all times when the control is

powered.

 Check for 120 VAC on terminals L1 and L2.

YES

Does the

Display Read

The Control is

Purging Latent

Heat from the

Boiler.

The Thermal Pre-Purge feature holds off the burner until the control

determines if the latent heat in the boiler can satisfy the heat call.

YES

When the low temperature

setting is set to OFF, the

HydroStat will act as a cold

start control. The burner

will not fire unless there is

a call from the thermostat

(T-T) or an external zone

(ZC-ZR).

 Set thermostat to call

for heat. Burner should

fire.

 If the boiler has a tank-

less coil, set the Low

Temperature Limit to

maintain temperature.

YES

CAUTION – ALWAYS ALLOW A BOILER TO COOL BEFORE ADDING WATER

The burner will not fire until the low water condition is satisfied.

 Check that the system is filled with water.

 Check that the sensor is inserted fully into the well and contact

between its spring clip and the copper well tube is made.

 Check that the control is tightly clamped to the well.

Also see page 8 for additional troubleshooting information.

HydroStat 3150 Instructions Page 9

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Hydrolevel 3150 User Manual Page 9

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