User Guide

68
E. Diagnostic Mode
Enter Diagnostic Mode by pressing and holding both the LH and RH buttons for at least 3s. The RH (“Next”) button navigates
between screens. The LH (“Done”) button returns to User Mode. All Diagnostic Mode screens are shown in Figure 12.7. A
description of each is below. For more information on troubleshooting, see Section XIV.
uA–Flamesignalinmicro-Amps. This is shown as “---“ when the burner is off.
Alert–Notused (screen will always read zero).
Lockout–Showsthecodeforthemostrecentlockoutthatoccurred. If none have occurred since this control was powered up, this
screen will read zero. A list of lockout codes is shown in Section XIV.
T–Showsthecurrentdifferencebetweenthesupplyandreturntemperatures.
LF–Forcestheburnertorunatlowreifitison (used for combustion testing). Pressing the LH (“Done”) button returns the user
to User mode and also returns the burner to automatic modulation. If no button on pressed while on this screen for 15 minutes,
control panel will automatically return to User Mode and burner will return to automatic operation.
HF-Forcestheburnertorunathighreifitison (used for combustion testing). As with the HF screen, pressing the LH
(“Done”) button or staying on this screen for 15 minutes without touching a button returns the user to User Mode and also restores
automatic modulation.
FromUserMode
Flame
Signal
AlertCode
(NotUsed)
Codefor
LastLockout
CurrentBoiler
WaterΔT
LowFire
Hold
HighFire
Hold
DiagnosticModeButtonUsage:
LH(Done)–ReturntoUserMode
RH(Next)–Movetonextscreen
Automaticmodulationrestoredwhennot
onHForLFscreen

ForalistofHoldandLockoutCodes,seeSectionXIV
FIGURE 12.7: DIAGNOSTIC MODE SCREENS