Velocity Shadow Series, Installation And Operating Instructions Manual

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XIV. Troubleshooting
The following pages contain information for use in diagnosing control problems. When using this information the following
should be kept in mind:
1) This information is only meant to be used by a professional heating technician as an aid in diagnosing boiler
problems.
2) Where applicable, follow all precautions outlined in the Section XI (Start-up and Checkout).
3) All controls on the boiler are tested at least once in the manufacturing process and a defective control or
component is generally the least likely cause. Before replacing a component, try to rule out all other possible causes.
A. Using the Display to Troubleshoot
The display communicates problems in one of three ways, depending upon the nature of the problem:
Hold – A condition exists that, when cleared, will allow burner to automatically fire. This is similar to what is sometimes called a
“soft lockout”, except that Holds also occur during normal operation (for example while the control is waiting for the fan to come
up to the pre-purge speed). When a Hold is present, “Hold” is shown on the home screen as shown in Figure 14.0. If the Hold
persists, the home screen will alternately flash the outlet temperature and the Hold Code as shown in Figure 14.1. A list of these
codes, and their meanings, are shown in Table 14.4.
Lockout – An abnormal condition exists that, when cleared, will require manual reset of the control. When a Lockout is present,
“Lockout” is shown on the home screen as shown in Figure 14.2 and the home screen will alternately flash the outlet temperature
and the Lockout Code as shown. A list of these codes, and their meanings, are shown in Table 14.4. Codes used for Holds and
Lockouts are the same and in some cases a hold condition that lasts long enough will become a Lockout. Lockouts can be cleared
by either pressing the LH button as shown in Figure 14.3, or pressing the reset button on the control itself. The most recent
Lockout can be seen, and cleared, on the “Lockout screen” shown in Figure 12.7 (interrupting power to the boiler also clears this
history).
Alert – Not used in this application.
DANGER
• Explosion Hazard. Electrical Shock Hazard. Burn Hazard. This boiler uses flammable gas, high
voltage electricity, moving parts, and very hot water under high pressure. Assure that all gas
and electric power supplies are off and that the water temperature is cool before attempting any
disassembly or service.
• Do not attempt any service work if gas is present in the air in the vicinity of the boiler. Never modify,
remove or tamper with any control device.
WARNING
• This boiler must only be serviced and repaired by skilled and experienced service technicians.
• If any controls are replaced, they must be replaced with identical models.
• Read, understand and follow all the instructions and warnings contained in all the sections of this
manual.
• If any electrical wires are disconnected during service, clearly label the wires and assure that the
wires are reconnected properly.
• Never jump out or bypass any safety or operating control or component of this boiler.
• Read, understand and follow all the instructions and warnings contained in ALL of the component
instruction manuals.
• Assure that all safety and operating controls and components are operating properly before placing
the boiler back in service.