Instruction manual

Finned copper tube gas boilers & water heaters – Control manual

Troubleshooting (continued)

Situation Suggested procedure

You have forgotten the password.

Turn the ON/OFF switch o. en depress and hold the ESC key while turning it back on. is will load ❑

the default password “AAAAAA”.

Firmware update program starts

to load, but then stops.

Ensure that the USB driver for your PC/Laptop computer is properly installed. ❑

H-Net boilers are detected but

then lost and then detected again.

e H-Net communications cable may be receiving interference from the blower, ignition, or other forms ❑

of radiated electrical noise.

Termination of the jumpers may not be correct or there is more than one master. ❑

Ensure that the termination dip switches are set on the MASTER boiler and only the LAST MEM-a.

BER boiler. All of the other member boilers should have their termination dip switches OFF.

ere may be two or more MASTER boilers. Ensure that only one header sensor is present and con-b.

nected to the HEADER input. ere should be no wires or sensors connected to the HEADER input

if the boiler is operating as a member.

Verify that the HNet cables are of a shielded or twisted pair type. Shielding of the cable is required.c.

Minimize possible electrical interference by routing the communications cables away from electrical d.

noise sources, such as motors, ignition controls, contactors, etc.

Only the MASTER boiler Fires, but

the system has many boilers and is

using H-Net.

In order for the MASTER boiler to act as a MASTER, the header sensor must be set to TYPEZ, and there ❑

must be a header sensor present.

At power-up, the header sensor is auto detected. If the temperature of the header sensor at power-up is ❑

greater than –25 °F and less than 240 °F it is considered a valid sensor. e boiler will default to the MEM-

BER mode if the temperature is not in this range, and can only be run locally or by external inputs.

e HNet needs a communications cable daisy-chained between boilers. Ensure that a good connection ❑

is made on the communications board and that the lights on the dual RJ45 jacks ash (roughly twice a

second). e MASTER is the only one that should ash with no communications cables plugged in.

You have forgotten the password.

Turn the ON/OFF switch o. en depress and hold the ESC key while turning it back on. is will load ❑

the default password “AAAAAA”.

Firmware update program starts

to load, but then stops, or does

not load at all.

Check that the termination switches, J3 and J6, are not in the termination position. If they are, switch them ❑

back temporarily while updating. Restore the switch positions aerwards for proper communication with

a building management system.

Ensure that the USB driver for your PC/Laptop computer is properly installed. ❑

Table 12 Troubleshooting suggestions (continued)