EMI WLCA NO HEATING Hot Water, NO HEATING Electric Heat, Fans Will Not Run, Electric Overheat

TROUBLESHOOTING SECTION

NO HEATING (Electric Heat)	FANS WILL NOT RUN
POSSIBLE CAUSES/REMEDIES	POSSIBLE CAUSES/REMEDIES

INCORRECT MODE SETTING (MICRO UNITS ONLY) – Check that the transmitter Mode is set to Heat or Auto Mode.

SET POINT TOO LOW – Check the set point on the trans- mitter or wall mounted thermostat and adjust if necessary.

OVERHEAT CUT OUT TRIPPED – (See section “Electric Overheat.”)

Investigate cause of over heat condition.

•Possible low airflow, check filter condition. (See maintenance instructions for more information).

•Possible fan failure. Check fans. (See section “Fans Will Not Run”)

Remove power from unit and reset manual overheat cut-out by rubbing. DO NOT PRESS!!

Consult EMI technical support for instruction if necessary.

HEATER ELEMENT FAILED – Investigate and replace if necessary.

FAULTY HEATER RELAY – Check signals to relay and check action of relay contacts. Replace relay or PCB if nec- essary.

NO HEATING (Hot Water)

POSSIBLE CAUSES/REMEDIES

INCORRECT MODE SETTING (MICRO UNITS ONLY) – Check that the transmitter MODE is set to Heat or Auto Mode.

SET POINT TOO LOW – Check the set point on the trans- mitter or wall mounted thermostat and adjust if necessary.

BLOCKED OR DIRTY FILTERS CAUSING LOW AIRFLOW

–Check filter condition (See maintenance instructions for more information).

NO HOT WATER/PUMPS FAILED – Check hot water source and supply to unit.

FAULTY VALVE/ACTUATOR – Check actuator by manu- ally opening and closing valve, replace if faulty.

FAULTY HEATER RELAY – Check signals to relay and check action of relay contacts. Replace relay or PCB if nec- essary.

LOOSE WIRE – Check all fan wire connections. Use unit’s electrical schematic to verify that fan is wired correctly.

FAULTY FAN CAPACITOR – Check fan capacitors, replace if necessary.

FAULTY FAN MOTOR – Check fan motor protector for open circuit, replace if necessary.

ELECTRIC OVERHEAT

The electric heat circuit contains one automatic reset and one manual reset overheat cut-out protection switch for each electric heat element fitted to the unit. The cut-outs are wired in line with the mains power flowing in each element and operate as described below.

AUTO CUT-OUT:If the auto cut-out trips, the elec- tric heat is temporarily disabled until the unit tem- perature falls and causes the overheat cut-out to automatically reset.

MANUAL CUT-OUT:If the manual cut-out trips, the electric heat is disabled until the unit temperature falls and the overheat cut-out is manually reset. It will typically take five minutes for the unit tempera- ture to fall sufficiently to allow the cut-out to be re- set. The cut-out should only be reset by a qualified and competent electrician and with the main power switched off. Ensure the elements have cooled suf- ficiently.

! WARNING !

THIS EQUIPMENT CONTAINS LIVE ELECTRICAL AND MOVING PARTS. ISOLATE ALL ELECTRICAL EQUIP- MENT BEFORE ANY MAINTENANCE WORK IS CAR- RIED OUT!!

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