Install Instructions

2-525.2
77
SERVICE & TROUBLESHOOTING
WARNING
When servicing or repairing this equipment, use only factory
approved service replacement parts. A complete replacement
parts list may be obtained by contacting Modine Manufacturing
Company. Refer to the rating plate on the unit for complete
unit substitution of parts or controls not approved by the
factory will be at the owner’s risk.
CAUTION
Do not reuse any electrical component which has been wet.
Such component must be replaced.
IMPORTANT
To check most of the Possible Remedies in the trouble-
shooting guide listed in Table 7.1, refer to the applicable
sections of the manual.
Table 7.1 - Troubleshooting
PROBLEM POSSIBLE CAUSE(S) REMEDY
Replacement parts can be obtained from Modine by submitting
the model number, power code, control code and serial number
shown on the rating plate attached to the unit, along with a
description of the part.
1. a. Turn on switch or thermostat.
b. Move thermostat to higher setting.
c. Replace fuse or reset disconnect switch.
2. Replace fuses.
3. Check wiring and connections. Refer to diagram inside
control panel.
4. Check continuity with volt-ohmmeter. Replace defective
part if necessary.
5. Check secondary voltage with voltmeter. Replace if
necessary.
1. a. Not enough air volume over elements. Louvers must
be open at least 45°.
b. Check motor rpm against nameplate rating. Replace
motor if speed is too slow.
c. Defective limit control. Check wiring and connections.
Check continuity through control. Replace if necessary.
2. Change switch position.
3. Check all wiring and connections. See diagram inside
control compartment.
4. Replace element fuses.
1. a. Check for loose electrical connections. Check wiring
with diagram in control compartment.
b. Repair or replace burned out defective motor.
c. Voltage too high or too low. Check voltage with
voltmeter.
2. Check for continuity with volt-ohmmeter. Replace if
necessary.
3. Check all wiring and connections. See diagram inside
control compartment.
1. Add more units or increase size of units.
2. Lower units.
3. Repair, replace motor or reverse fan rotation.
4. Disconnect internal wiring and check element resistance
with ohmmeter.
Unit does not operate
Fan operates but element
does not heat
Elements heat but fan does
not operate
Insufficient heat
1. Electric circuit in open position.
2. Blown fuses in control compartment.
3. Defective or incorrect wiring.
4. Defective thermostat or switch.
5. Defective or burned out control
transformer.
1. Power interrupted by overheat control.
2. Summer-winter switch in summer position.
3. Defective or incorrect wiring.
4. Blown element fuses on HER200 and
HER250 w/208 or 240V-3ø power supply.
1. Fan motor failure.
2. Summer-winter switch defective or
improperly wired.
3. Defective or incorrect wiring.
1. Too few units for heat loss.
2. Unit mounted too high.
3. Fan operates backwards.
4. Burned out element.