55
CONTENTS
DRV40 Display Errors ..................................................................................56
Common Faults
“Blend temperature rises when system is in zero demand...” ...........58
“Outlet temperature uctuates more than ± 2°C...” ............................60
“LCD Display shows any of the following...” .......................................61
“Constant difference between blend circuit temperature reading
and DRV40 temperature display...” .....................................................63
“Unable to adjust outlet temperature...” ..............................................64
“No display...” .........................................................................................66
“No display or no control...” .................................................................66
“Cannot read the LCD display...” ..........................................................67
“High pitched noise from DRV40...” .....................................................68
“Water leaking from DRV40...” .............................................................. 69
FAULT DIAGNOSIS
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